Liabilities / Assets
55th percentile
Higher debt load relative to assets than 55% of similar nonprofits.
Chester County Historical Society
EIN 23-1371942 • 501(c)3 • West Chester, PA
Profile
To preserve the history of chester county and southeastern pa
Siviq Scores
Precomputed percentiles relative to similar nonprofits. These scores are descriptive rather than judgmental.
0.22x
Liabilities / Revenue
88th percentile
Higher debt load relative to revenue than 88% of similar nonprofits.
Net Margin
13th percentile
Higher net margin than 13% of similar nonprofits.
Top Officer Pay
21st percentile
Higher top officer pay than 21% of similar nonprofits.
Top officer pay equals 8.1% of source-year revenue.
Asset Growth
37th percentile
Faster asset growth than 37% of similar nonprofits.
Revenue Growth
70th percentile
Faster revenue growth than 70% of similar nonprofits.
Balance Sheet
Assets
Up$10,186,814
Up $79,235 (+0.8%) from 2023
Liabilities
Up$2,235,618
Up $89,345 (+4.2%) from 2023
Net Assets
Down$7,951,196
Down $10,110 (-0.1%) from 2023
Revenue
Up$1,181,315
Up $190,692 (+19%) from 2023
Expenses
Down$1,374,025
Down $201,588 (-13%) from 2023
Net Income
Up-$192,710
Up $392,280 (+67%) from 2023
Trend Graphs
Filings
Most recent year
2024 • Form 990Facts available. Structured filing facts are available, but richer extracted sections are limited.
- Assets
- $10,186,814
- Liabilities
- $2,235,618
- Net assets
- $7,951,196
- Revenue
- $1,181,315
- Expenses
- $1,374,025
- Net income
- -$192,710
Latest Filing Detail
Jump To
Filing Snapshot
- Filing Period
- Jan 1, 2024 to Dec 31, 2024
- Signed
- Oct 23, 2025
- Return Version
- 2024v5.2
- Gross Receipts
- $1,328,584
Mission and Program Overview
Mission
To preserve the history of chester county and southeastern pa
To inspire, inform and build the chester county community identity.
Balance Sheet Detail
| Line | Beginning | End | Change |
|---|---|---|---|
| Assets | |||
| Investments Other Securities | $2,711,811 | $2,832,705 | ▲ $120,894 |
| Investments in Publicly Traded Securities | $1,140,547 | $2,302,285 | ▲ $1,161,738 |
| Land, Buildings, and Equipment, Net | $1,776,498 | $1,646,622 | ▼ $129,876 |
| Savings and Temporary Cash Investments | $2,348,200 | $1,285,706 | ▼ $1,062,494 |
| Cash and Non-Interest-Bearing Accounts | $557,992 | $584,797 | ▲ $26,805 |
| Prepaid Expenses and Deferred Charges | $19,865 | $24,453 | ▲ $4,588 |
| Pledges and Grants Receivable | $6,423 | $19,410 | ▲ $12,987 |
| Accounts Receivable | $0 | $0 | → $0 |
| Other Notes and Loans Receivable, Net | $0 | $0 | → $0 |
| Receivable From Disqualified Prsn | $0 | $0 | → $0 |
| Receivables From Officers Etc | $0 | $0 | → $0 |
| Investments Program Related | $0 | $0 | → $0 |
| Intangible Assets | $0 | $0 | → $0 |
| Inventories for Sale or Use | $0 | $0 | → $0 |
| Loans From Officers Directors | $0 | $0 | → $0 |
| Total Assets | $10,107,579 | $10,186,814 | ▲ $79,235 |
| Other Assets Total | $1,546,243 | $1,490,836 | ▼ $55,407 |
| Liabilities | |||
| Other Liabilities | $1,679,092 | $1,800,817 | ▲ $121,725 |
| Mortgage Notes Payable Secured by Investment Property | $300,400 | $298,073 | ▼ $2,327 |
| Accounts Payable and Accrued Expenses | $129,345 | $131,468 | ▲ $2,123 |
| Deferred Revenue | $37,436 | $5,260 | ▼ $32,176 |
| Grants Payable | $0 | $0 | → $0 |
| Unsecured Notes Loans Payable | $0 | $0 | → $0 |
| Escrow Account Liability | $0 | $0 | → $0 |
| Tax Exempt Bond Liabilities | $0 | $0 | → $0 |
| Total Liabilities | $2,146,273 | $2,235,618 | ▲ $89,345 |
| Net Assets / Fund Balance | |||
| Net Assets With Donor Restrictions | $4,404,861 | $4,663,141 | ▲ $258,280 |
| Net Assets Without Donor Restrictions | $3,556,445 | $3,288,055 | ▼ $268,390 |
| Total Net Assets Fund Balance | $7,961,306 | $7,951,196 | ▼ $10,110 |
| Total Liabilities and Net Assets / Fund Balance | $10,107,579 | $10,186,814 | ▲ $79,235 |
Asset Categories
| Asset | Book Value | Depreciation | Basis |
|---|---|---|---|
| Buildings | $1,590,619 | $607,785 | $2,198,404 |
| Equipment | $42,756 | $125,261 | $168,017 |
| Leasehold Improvements | $13,247 | $779 | $14,026 |
| Other Assets Org | $1,490,836 | - | - |
| Other Securities | $2,832,705 | - | - |
Endowment Activity
| Period | Beginning | Contrib. | Gain/Loss | Other Uses | End |
|---|---|---|---|---|---|
| 2024 | $1,262,577 | - | ▲ $121,949 | $28,689 | $1,355,837 |
| 2023 | $1,186,879 | - | ▲ $97,489 | $21,791 | $1,262,577 |
| 2022 | $1,383,151 | - | ▼ $161,012 | $35,260 | $1,186,879 |
| 2021 | $1,278,576 | - | ▲ $170,032 | $65,457 | $1,383,151 |
| 2020 | $1,148,260 | - | ▲ $142,547 | $12,231 | $1,278,576 |
Compensation and Service Providers
Employees
| Name | Title | Full / Part Time | Base | Other | Total |
|---|---|---|---|---|---|
| Conor Hepp | President | FT | $90,606 | $4,905 | $95,511 |
Board Members and Trustees
| Name | Title |
|---|---|
| Holly Stoviak | Chair |
| Cuyler Walker | Trustee |
| Damon Sinclair | Trustee |
| Holly Gross | Trustee |
| John Silverthorne | Trustee |
| Mary Brooks | Trustee |
| Mary-ellen H Allen | Trustee |
| Patrick Mckenna | Trustee |
| Robert Vosburgh | Trustee |
| Robert Vosburgh Jr Esq | Trustee |
| DIANE D'ARCANGELO EDD | Trustee (eff 05/24) |
| Kalia M Reynolds Edd | Trustee (eff 07/24) |
| Vernet C Spence-brown | Trustee (eff 07/24) |
| Andrew Dinniman | Trustee (term 01/24) |
| Dr Mian Jan Facc Fscai | Trustee (term 01/24) |
| Todd Pride | Trustee (term 01/24) |
| Charles H White | Trustee (term 06/24) |
| Jeff Groff | Trustee (term 06/24) |
| Rebecca Hunt | Trustee (term 11/24) |
| Anne Skillman | Trustee/sec |
| Andrew Gordon | Trustee/VP |
| Matt Mckeon Esq | Secretary (term 01/24) |
| DOMENIC D'GINTO | Treasurer |
Revenue and Support
Revenue Composition
- Contributions and Grants
- $569,603
- Program Service Revenue
- $317,755
- Investment Income
- $305,110
- Other Revenue
- $-11,153
- All Other Contributions
- $392,994
- Change in Net Assets
- $-192,710
Audited Revenue Reconciliation
- Revenue per Audited Statements
- $1,314,853
- Revenue Not Reported on Financial Statements
- $-133,538
- Revenue Not Reported on Form 990
- $182,600
- Other Revenue Adjustments
- $-147,269
- Total Revenue per Audited Statements
- $1,497,453
- Total Revenue per Form 990
- $1,181,315
Expenses and Functional Allocation
Major Expense Lines
| Line Item | Amount |
|---|---|
| Salaries, Compensation, and Employee Benefits | $774,945 |
| Other Expenses | $599,080 |
| Total Fundraising Expense | $230,845 |
| Grants and Similar Amounts Paid | $0 |
| Professional Fundraising Fees | $0 |
Functional Expense Allocation
| Line Item | Program | Management | Fundraising | Total |
|---|---|---|---|---|
| Other Salaries and Wages | $402,104 | $61,418 | $126,960 | $590,482 |
| Occupancy | $178,884 | $22,649 | $2,578 | $204,111 |
| Depreciation Depletion | $148,197 | $5,110 | $1,703 | $155,010 |
| Current Officers, Directors, Trustees, and Key Employees | $65,038 | $9,932 | $20,541 | $95,511 |
| Fees for Services Accounting | $1,868 | $73,346 | $14,798 | $90,012 |
| Office Expenses | $19,129 | $4,323 | $33,101 | $56,553 |
| Payroll Taxes | $32,985 | $5,016 | $10,480 | $48,481 |
| Other Employee Benefits | $27,535 | $4,188 | $8,748 | $40,471 |
| Fees for Services Other | $532 | $20,874 | $4,212 | $25,618 |
| Fees for Service Investment Mgmnt Fees | - | $13,731 | - | $13,731 |
| Insurance | $8,908 | $1,353 | $2,817 | $13,078 |
| Interest | - | $7,897 | - | $7,897 |
| Advertising | $2,469 | $3,461 | $973 | $6,903 |
| Travel | $959 | $2,269 | $2,420 | $5,648 |
| Other Expenses | $509 | $915 | $250 | $509 |
| Total Functional Expenses | $895,927 | $247,253 | $230,845 | $1,374,025 |
Audited Expense Reconciliation
| Line Item | Amount |
|---|---|
| Total Expenses per Audited Statements | $1,507,563 |
| Total Expenses per Form 990 | $1,374,025 |
| Expenses per Audited Statements | $1,360,294 |
| Expenses Not Reported on Form 990 | $147,269 |
| Expenses Not Reported on Financial Statements | $13,731 |
Fundraising, Events, and Gaming
- Fundraising activities
- Yes
- Gaming activities
- No
- Professional fundraiser used
- No
Fundraising and Gaming Totals
| Line Item | Amount |
|---|---|
| Fundraising Direct Expenses | $51,642 |
| Fundraising Gross Income | $51,642 |
| Gaming Direct Expenses | $0 |
| Gaming Gross Income | $0 |
| Professional Fundraising Fees | $0 |
Fundraising Events
| Event | Gross Receipts | Gross Revenue | Direct Expenses | Net Income |
|---|---|---|---|---|
| Antiques Show | $32,186 | - | - | - |
| History Makers | $48,532 | $32,132 | $9,522 | $22,610 |
| Total Events | $109,828 | $51,642 | $51,642 | - |
Political and Lobbying Activity
- Political campaign activity
- No
- Lobbying activity
- No
- Subject to proxy tax
- No
Insider Transactions and Loans
Loans and Receivables
| Line Item | Beginning | End | Change |
|---|---|---|---|
| Loans from Officers, Directors, Trustees, and Key Employees | $0 | $0 | → $0 |
| Receivables from Disqualified Persons | $0 | $0 | → $0 |
| Receivables from Officers, Directors, Trustees, and Key Employees | $0 | $0 | → $0 |
Debt and Bond Financing
Other Reported Liabilities
| Liability | Amount |
|---|---|
| Operating Lease Liabilities | $1,800,817 |
Governance and Compliance
Governance Checklist
- Compiled or reviewed by an accountant
- No
- Annual disclosure for covered persons
- Yes
- Audit committee
- Yes
- Backup withholding compliance
- Yes
- Business relationship with 35% controlled entity
- No
- Business relationship with family members
- No
- Business relationship with organization members
- No
- Material changes to governing documents
- No
- Compensation from other sources disclosed
- No
- CEO compensation reviewed
- Yes
- Other officer compensation reviewed
- No
- Conflict-of-interest policy
- Yes
- Audited financial statements prepared
- No
- Key decisions subject to board approval
- No
- Management duties delegated
- No
Governance Explanations
FORM 990, PART VI, SECTION B, LINE 11B:
“The form 990 is reviewed by the finance committee and presented to the board prior to filing.”
FORM 990, PART VI, SECTION B, LINE 12C:
“Board members, staff and certain volunteers of the organization ("interested parties") are required to disclose any actual or potential conflict of interest as soon as it is known, or reasonably should be known. Interested parties are required to provide an annual questionnaire to the board president and in the absence of the board president, to the secretary. Copies of these questionnaires are also provided to the president. This questionnaire is used to fully and completely disclose the facts about any actual or potential conflicts. An additional disclosure statement will be completed if an actual or potential conflict arises. If an actual or potential conflict arises between the organization and an interested party, the board or directors shall determine the appropriate response to that conflict. If a conflict exists, the organization will refrain from completing that action until the conflict has been addressed. Failure to disclosure possible conflicts of interest will be addressed and investigated by the board of directors and appropriate disciplinary or corrective action will be taken at that time.”
FORM 990, PART VI, SECTION B, LINE 15A:
“The salary of the president is subject to annual review and approval by the board of directors.”
FORM 990, PART VI, SECTION C, LINE 19:
“Governing documents, conflict of interest policy and financial statements are made available upon request.”
Filing and Contact Details
Filer
- Filer Name
- Chester County Historical Society
- EIN
- 23-1371942
- In Care Of
- % THE ORGANIZATION
- Phone
- 6106924800
- Address
- 225 North High Street, West Chester, PA 19380
Signing Officer
- Name
- Conor Hepp
- Title
- President
- Phone
- 6106924800
- Signed
- 2025-10-23
- Discuss with paid preparer
- Yes
Organization Details
- Principal Officer
- Conor Hepp
- Formed
- 1945
- Legal Domicile
- Pa
- Voting Board Members
- 14
- Independent Board Members
- 14
- Employees
- 28
- Volunteers
- 120
Preparer
- Firm
- Withumsmithbrown Pc
- Address
- 1835 MARKET STREET 300, PHILADELPHIA, PA 19103-2945
- Preparer
- Richard Ruvelson
- Phone
- 2155462140
Supplemental Narrative
Additional Explanations
FORM 990, PART XI, LINE 9 CHANGES IN NET ASSETS:
“Change in value of split interest agreements 120,894”
Financial Statement Notes
PART III, LINE 1A:
“Collection items acquired either through purchase or donation are not capitalized. Accordingly, the cost of collection items purchased is reported as a decrease in net assets and proceeds from the sale of collection items are reported as an increase in net assets.”
PART III, LINE 4:
“The chester county historical society (cchs) inspires, informs, and builds community identity by preserving and sharing the remarkable story of chester county and its people. Representing more than three centuries of regional history, our collections include objects, manuscripts, published resources, and photographic archives. Museum collections include but are not limited to agricultural, industrial and domestic artifacts; decorative and fine art items including paintings, prints, ceramics and glass, furniture, and metals; prehistoric and native american artifacts (adhering to the nagpra act of 1990); clothing and textiles; and dolls and toys. Library collections include but are not limited to books, pamphlets, manuscripts including personal papers, archives, business records, diaries, scrapbooks, broadsides and posters, maps, architectural drawings, ephemera, and chester county historical society archives. Photo archives collections include images produced from the 1840s to the present such as: portraits, landscapes, the built environment and local events. The subjects may be casual or formal. This area also contains negatives and transparencies, audiovisual materials such as oral histories, muscial recordings by local composers or musicians, videos of events, and digital recordings.”
PART V, LINE 4:
“The organization's endowment funds are used to support various programs based on the spending policy as determined by the board of directors.”
PART X, LINE 2:
“U.s. Gaap requires entities to evaluate, measure, recognize and disclose any uncertain income tax positions taken on their tax returns. Gaap prescribes a minimum threshold that a tax position is required to meet in order to be recognized in the financial statements. The society believes that it had no uncertain tax positions as defined in u.s. Gaap.”
PART XI, LINE 2D - OTHER ADJUSTMENTS:
“Change in value of split interest agreements 120,894”
PART XI, LINE 4B - OTHER ADJUSTMENTS:
“Museum sales cost of goods sold -9,125 fundraising expenses -51,642 rental expenses -86,502 total to schedule d, part xi, line 4b -147,269”
PART XII, LINE 2D - OTHER ADJUSTMENTS:
“Museum sales cost of goods sold 9,125 fundraising expenses 51,642 rental expenses 86,502 total to schedule d, part xii, line 4b 147,269”
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This appendix keeps the raw XML leaves available for debugging and edge-case review. The human report above is the primary experience.
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| IRS990/Desc | 0 | THE CHESTER COUNTY HISTORICAL SOCIETY (THE "SOCIETY") IS A HISTORICAL REPOSITORY FOR ITEMS MADE OR USED IN CHESTER COUNTY, PENNSYLVANIA. AS SUCH, THE SOCIETY PRESERVES AND SHARES THE COUNTY'S REMARKABLE HISTORY IN POWERFUL AND RELEVANT WAYS: -ACTING AS STEWARD OF AN UNPARALLEELED COLLECTION OF ARTIFACTS, MANUSCRIPTS, PHOTOGRAPHS AND VOLUMES THAT DOCUMENTS OVER 300 YEARS OF COUNTY HERITAGE. - OFFERING INNOVATIVE EDUCATIONAL PROGRAMS AND EXHIBITIONS TO SHARE THE EXCITEMENT OF HISTORY. - HELPING AUDIENCES EXPLORE HISTORY THROUGH SOCIETY RESOURCES AND STAFF EXPERTISE. |
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| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 20 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 21 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 22 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 23 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 0 | 40.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 1 | 2.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 2 | 2.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 3 | 2.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 4 | 2.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 5 | 2.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 6 | 2.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 7 | 2.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 8 | 2.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 9 | 2.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 10 | 2.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 11 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 12 | 2.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 13 | 2.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 14 | 2.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 15 | 2.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 16 | 2.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 17 | 2.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 18 | 2.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 19 | 2.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 20 | 2.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 21 | 2.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 22 | 2.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 23 | 2.0 |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 4 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 5 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 6 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 7 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 8 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 9 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 10 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 11 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 12 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 13 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 14 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 15 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 16 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 17 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 18 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 19 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 20 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 21 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 22 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 23 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 4 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 5 | X |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 0 | 4905 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 11 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 12 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 13 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 14 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 15 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 16 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 17 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 18 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 19 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 20 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 21 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 22 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 23 | 0 |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 0 | CONOR HEPP |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | HOLLY STOVIAK |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | DOMENIC D'GINTO |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | MATT MCKEON ESQ |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | ANDREW DINNIMAN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | HOLLY GROSS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | DR MIAN JAN FACC FSCAI |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | ROBERT VOSBURGH |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | JEFF GROFF |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | TODD PRIDE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | JOHN SILVERTHORNE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 11 | ANNE SKILLMAN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 12 | CUYLER WALKER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 13 | CHARLES H WHITE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 14 | DAMON SINCLAIR |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 15 | ANDREW GORDON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 16 | MARY-ELLEN H ALLEN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 17 | MARY BROOKS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 18 | PATRICK MCKENNA |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 19 | REBECCA HUNT |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 20 | DIANE D'ARCANGELO EDD |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 21 | KALIA M REYNOLDS EDD |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 22 | VERNET C SPENCE-BROWN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 23 | ROBERT VOSBURGH JR ESQ |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 0 | 90606 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 11 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 12 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 13 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 14 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 15 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 16 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 17 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 18 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 19 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 20 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 21 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 22 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 23 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 11 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 12 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 13 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 14 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 15 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 16 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 17 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 18 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 19 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 20 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 21 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 22 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 23 | 0 |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 0 | PRESIDENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | CHAIR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | TREASURER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | SECRETARY (TERM 01/24) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | TRUSTEE (TERM 01/24) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | TRUSTEE (TERM 01/24) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 8 | TRUSTEE (TERM 06/24) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 9 | TRUSTEE (TERM 01/24) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 10 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 11 | TRUSTEE/SEC |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 12 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 13 | TRUSTEE (TERM 06/24) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 14 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 15 | TRUSTEE/VP |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 16 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 17 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 18 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 19 | TRUSTEE (TERM 11/24) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 20 | TRUSTEE (EFF 05/24) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 21 | TRUSTEE (EFF 07/24) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 22 | TRUSTEE (EFF 07/24) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 23 | TRUSTEE |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | true |
| IRS990/Form990TFiledInd | 0 | true |
| IRS990/FormationYr | 0 | 1945 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | false |
| IRS990/FSAuditedBasisGrp/SeparateBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | true |
| IRS990/FundraisingActivitiesInd | 0 | true |
| IRS990/FundraisingAmt | 0 | 58186 |
| IRS990/FundraisingDirectExpensesAmt | 0 | 51642 |
| IRS990/FundraisingGrossIncomeAmt | 0 | 51642 |
| IRS990/GainOrLossGrp/SecuritiesAmt | 0 | 31412 |
| IRS990/GamingActivitiesInd | 0 | false |
| IRS990/GamingDirectExpensesAmt | 0 | 0 |
| IRS990/GamingGrossIncomeAmt | 0 | 0 |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 14 |
| IRS990/GovernmentGrantsAmt | 0 | 69845 |
| IRS990/GrantsPayableGrp/BOYAmt | 0 | 0 |
| IRS990/GrantsPayableGrp/EOYAmt | 0 | 0 |
| IRS990/GrantsToDomesticIndividualsGrp/TotalAmt | 0 | 0 |
| IRS990/GrantsToDomesticOrgsGrp/TotalAmt | 0 | 0 |
| IRS990/GrantsToIndividualsInd | 0 | false |
| IRS990/GrantsToOrganizationsInd | 0 | false |
| IRS990/GrantToRelatedPersonInd | 0 | false |
| IRS990/GrossAmountSalesAssetsGrp/SecuritiesAmt | 0 | 31412 |
| IRS990/GrossReceiptsAmt | 0 | 1328584 |
| IRS990/GrossRentsGrp/RealAmt | 0 | 68294 |
| IRS990/GrossSalesOfInventoryAmt | 0 | 15895 |
| IRS990/GroupReturnForAffiliatesInd | 0 | false |
| IRS990/IncludeFIN48FootnoteInd | 0 | true |
| IRS990/IncmFromInvestBondProceedsGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/IndependentAuditFinclStmtInd | 0 | true |
| IRS990/IndependentVotingMemberCnt | 0 | 14 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 0 |
| IRS990/IndoorTanningServicesInd | 0 | false |
| IRS990/InfoInScheduleOPartIIIInd | 0 | X |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InfoInScheduleOPartXIInd | 0 | X |
| IRS990/InformationTechnologyGrp/TotalAmt | 0 | 0 |
| IRS990/InsuranceGrp/FundraisingAmt | 0 | 2817 |
| IRS990/InsuranceGrp/ManagementAndGeneralAmt | 0 | 1353 |
| IRS990/InsuranceGrp/ProgramServicesAmt | 0 | 8908 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 13078 |
| IRS990/IntangibleAssetsGrp/BOYAmt | 0 | 0 |
| IRS990/IntangibleAssetsGrp/EOYAmt | 0 | 0 |
| IRS990/InterestGrp/ManagementAndGeneralAmt | 0 | 7897 |
| IRS990/InterestGrp/TotalAmt | 0 | 7897 |
| IRS990/InventoriesForSaleOrUseGrp/BOYAmt | 0 | 0 |
| IRS990/InventoriesForSaleOrUseGrp/EOYAmt | 0 | 0 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 273698 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 273698 |
| IRS990/InvestmentInJointVentureInd | 0 | false |
| IRS990/InvestmentsOtherSecuritiesGrp/BOYAmt | 0 | 2711811 |
| IRS990/InvestmentsOtherSecuritiesGrp/EOYAmt | 0 | 2832705 |
| IRS990/InvestmentsProgramRelatedGrp/BOYAmt | 0 | 0 |
| IRS990/InvestmentsProgramRelatedGrp/EOYAmt | 0 | 0 |
| IRS990/InvestmentsPubTradedSecGrp/BOYAmt | 0 | 1140547 |
| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 2302285 |
| IRS990/IRPDocumentCnt | 0 | 12 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 733825 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 1776498 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 1646622 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 2380447 |
| IRS990/LegalDomicileStateCd | 0 | PA |
| IRS990/LessRentalExpensesGrp/RealAmt | 0 | 86502 |
| IRS990/LoanOutstandingInd | 0 | false |
| IRS990/LoansFromOfficersDirectorsGrp/BOYAmt | 0 | 0 |
| IRS990/LoansFromOfficersDirectorsGrp/EOYAmt | 0 | 0 |
| IRS990/LobbyingActivitiesInd | 0 | false |
| IRS990/LocalChaptersInd | 0 | false |
| IRS990/MaterialDiversionOrMisuseInd | 0 | false |
| IRS990/MembershipDuesAmt | 0 | 48578 |
| IRS990/MembersOrStockholdersInd | 0 | false |
| IRS990/MethodOfAccountingAccrualInd | 0 | X |
| IRS990/MinutesOfCommitteesInd | 0 | true |
| IRS990/MinutesOfGoverningBodyInd | 0 | true |
| IRS990/MissionDesc | 0 | THE CHESTER COUNTY HISTORICAL SOCIETY (THE "SOCIETY") IS A NONPROFIT ORGANIZATION ESTABLISHED TO INSPIRE, INFORM AND BUILD COMMUNITY IDENTITY BY PRESERVING AND SHARING THE REMARKABLE STORY OF CHESTER COUNTY AND ITS PEOPLE. THE SOCIETY PROVIDES PUBLIC ACCESS TO THE IDEAS, ISSUES AND PROCESSES OF THE PAST THAT HAVE SHAPED THE PRESENT. ITS EXHIBITION, RESEARCH, SERVICES AND PROGRAMS SHARE THIS ACCESS WITH PEOPLE OF ALL AGES SEEKING TO UNDERSTAND OUR SHARED HERITAGE. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | false |
| IRS990/MoreThan5000KToOrgInd | 0 | false |
| IRS990/MortgNotesPyblScrdInvstPropGrp/BOYAmt | 0 | 300400 |
| IRS990/MortgNotesPyblScrdInvstPropGrp/EOYAmt | 0 | 298073 |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 7961306 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 7951196 |
| IRS990/NetGainOrLossInvestmentsGrp/ExclusionAmt | 0 | 31412 |
| IRS990/NetGainOrLossInvestmentsGrp/TotalRevenueColumnAmt | 0 | 31412 |
| IRS990/NetIncomeFromGamingGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/NetIncomeOrLossGrp/RelatedOrExemptFuncIncomeAmt | 0 | 6770 |
| IRS990/NetIncomeOrLossGrp/TotalRevenueColumnAmt | 0 | 6770 |
| IRS990/NetRentalIncomeOrLossGrp/ExclusionAmt | 0 | -18208 |
| IRS990/NetRentalIncomeOrLossGrp/TotalRevenueColumnAmt | 0 | -18208 |
| IRS990/NetUnrelatedBusTxblIncmAmt | 0 | 0 |
| IRS990/NetUnrlzdGainsLossesInvstAmt | 0 | 61706 |
| IRS990/NoDonorRestrictionNetAssetsGrp/BOYAmt | 0 | 3556445 |
| IRS990/NoDonorRestrictionNetAssetsGrp/EOYAmt | 0 | 3288055 |
| IRS990/NondeductibleContributionsInd | 0 | false |
| IRS990/OccupancyGrp/FundraisingAmt | 0 | 2578 |
| IRS990/OccupancyGrp/ManagementAndGeneralAmt | 0 | 22649 |
| IRS990/OccupancyGrp/ProgramServicesAmt | 0 | 178884 |
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