Civic Intelligence

Stillman Nature Center

EIN 36-3182273 • 501(c)3 • South Barrington, IL

Profile

To provide educational programs on conservation.

33 West Penny RoadSouth Barrington, IL 60010

www.stillmannc.org

Siviq Scores

Precomputed percentiles relative to similar nonprofits. These scores are descriptive rather than judgmental.

Liabilities / Assets

9th percentile

0.00x

Tied with the lowest-debt nonprofits in its peer group.

501(c)3 • $5M-$10M nonprofits • Source year 2022

Liabilities / Revenue

10th percentile

0.00x

Tied with the lowest-debt nonprofits in its peer group.

501(c)3 • $5M-$10M nonprofits • Source year 2022

Net Margin

64th percentile

12%

Higher net margin than 64% of similar nonprofits.

501(c)3 • $5M-$10M nonprofits • Source year 2022

Top Officer Pay

Score unavailable

No value available

No filing with officer rows is available for this organization yet.

Asset Growth

17th percentile

-5.4%

Faster asset growth than 17% of similar nonprofits.

501(c)3 • $5M-$10M nonprofits • Annualized from 2021 to 2022

Revenue Growth

56th percentile

9.7%

Faster revenue growth than 56% of similar nonprofits.

501(c)3 • $5M-$10M nonprofits • Annualized from 2021 to 2022

Balance Sheet
Liabilities / Assets9th percentile

Assets

Up

$6,322,790

Up $199,423 (+3.3%) from 2024

Liabilities

Flat

$0

Flat from 2024

Net Assets

Up

$6,322,790

Up $199,423 (+3.3%) from 2024

Operations
Liabilities / Revenue10th percentileNet Margin64th percentile

Revenue

Up

$278,584

Up $77,199 (+38%) from 2024

Expenses

Up

$156,805

Up $16,064 (+11%) from 2024

Net Income

Up

$121,779

Up $61,135 (+101%) from 2024

Trend Graphs

Balance Sheet Trend

Asset Growth17th percentile

Grouped bars show assets, liabilities, and net assets across loaded filings.

$8.0M$6.0M$4.0M$2.0M$0Assets 2010: $4,911,540Liabilities 2010: $0Net Assets 2010: $4,911,5402010Assets 2011: $4,953,535Liabilities 2011: $0Net Assets 2011: $4,953,5352011Assets 2012: $5,008,589Liabilities 2012: $0Net Assets 2012: $5,008,5892012Assets 2013: $5,196,241Liabilities 2013: $0Net Assets 2013: $5,196,2412013Assets 2014: $5,289,232Liabilities 2014: $0Net Assets 2014: $5,289,2322014Assets 2015: $5,248,076Liabilities 2015: $0Net Assets 2015: $5,248,0762015Assets 2016: $5,356,898Liabilities 2016: $0Net Assets 2016: $5,356,8982016Assets 2017: $5,493,784Liabilities 2017: $0Net Assets 2017: $5,493,7842017Assets 2018: $5,316,284Liabilities 2018: $0Net Assets 2018: $5,316,2842018Assets 2019: $5,679,644Liabilities 2019: $0Net Assets 2019: $5,679,6442019Assets 2020: $5,785,126Liabilities 2020: $0Net Assets 2020: $5,785,1262020Assets 2021: $6,046,836Liabilities 2021: $0Net Assets 2021: $6,046,8362021Assets 2022: $5,720,097Liabilities 2022: $0Net Assets 2022: $5,720,0972022Assets 2023: $5,881,013Liabilities 2023: $0Net Assets 2023: $5,881,0132023Assets 2024: $6,123,367Liabilities 2024: $0Net Assets 2024: $6,123,3672024Assets 2025: $6,322,790Liabilities 2025: $0Net Assets 2025: $6,322,7902025

Highlighted filing

2025

Assets$6,322,790
Liabilities$0
Net Assets$6,322,790
Open 2025 Filing

Operations Trend

Revenue Growth56th percentile

Revenue, expenses, and net income by year, with the latest filing highlighted.

$300K$200K$100K$0-$100KExpenses 2010: $92,4152010Expenses 2011: $88,9412011Expenses 2012: $84,0112012Revenue 2013: $100,753Expenses 2013: $94,735Net Income 2013: $6,0182013Revenue 2014: $115,396Expenses 2014: $101,775Net Income 2014: $13,6212014Revenue 2015: $117,517Expenses 2015: $111,033Net Income 2015: $6,4842015Revenue 2016: $118,623Expenses 2016: $109,612Net Income 2016: $9,0112016Revenue 2017: $119,730Expenses 2017: $119,350Net Income 2017: $3802017Revenue 2018: $152,125Expenses 2018: $119,387Net Income 2018: $32,7382018Revenue 2019: $198,458Expenses 2019: $126,315Net Income 2019: $72,1432019Revenue 2020: $128,004Expenses 2020: $120,817Net Income 2020: $7,1872020Revenue 2021: $146,657Expenses 2021: $128,153Net Income 2021: $18,5042021Revenue 2022: $160,919Expenses 2022: $141,137Net Income 2022: $19,7822022Revenue 2023: $131,069Expenses 2023: $146,829Net Income 2023: -$15,7602023Revenue 2024: $201,385Expenses 2024: $140,741Net Income 2024: $60,6442024Revenue 2025: $278,584Expenses 2025: $156,805Net Income 2025: $121,7792025

Highlighted filing

2025

Revenue$278,584
Expenses$156,805
Net Income$121,779
Open 2025 Filing

Filings

Most recent year

2025 • Form 990Detailed filing. Detailed filing data is available for this year.

Open filing
Assets
$6,322,790
Liabilities
$0
Net assets
$6,322,790
Revenue
$278,584
Expenses
$156,805
Net income
$121,779
Balance SheetOperations
YearAssetsLiabilitiesNet AssetsRevenueExpensesNet Income
2025Detailed filing. Detailed filing data is available for this year.$6.32$0.00$6.32$0.28$0.16$0.12
2024Detailed filing. Detailed filing data is available for this year.$6.12$0.00$6.12$0.20$0.14$0.06
2023Detailed filing. Detailed filing data is available for this year.$5.88$0.00$5.88$0.13$0.15$0.02
2022Detailed filing. Detailed filing data is available for this year.$5.72$0.00$5.72$0.16$0.14$0.02
2021Detailed filing. Detailed filing data is available for this year.$6.05$0.00$6.05$0.15$0.13$0.02
2020Detailed filing. Detailed filing data is available for this year.$5.79$0.00$5.79$0.13$0.12$0.01
2019Detailed filing. Detailed filing data is available for this year.$5.68$0.00$5.68$0.20$0.13$0.07
2018Detailed filing. Detailed filing data is available for this year.$5.32$0.00$5.32$0.15$0.12$0.03
2017Detailed filing. Detailed filing data is available for this year.$5.49$0.00$5.49$0.12$0.12$0.00
2016Detailed filing. Detailed filing data is available for this year.$5.36$0.00$5.36$0.12$0.11$0.01
2015Detailed filing. Detailed filing data is available for this year.$5.25$0.00$5.25$0.12$0.11$0.01
2014Detailed filing. Detailed filing data is available for this year.$5.29$0.00$5.29$0.12$0.10$0.01
2013Detailed filing. Detailed filing data is available for this year.$5.20$0.00$5.20$0.10$0.09$0.01
2012Facts available. Structured filing facts are available, but richer extracted sections are limited.$5.01$0.00$5.01$0.08
2011Facts available. Structured filing facts are available, but richer extracted sections are limited.$4.95$0.00$4.95$0.09
2010Facts available. Structured filing facts are available, but richer extracted sections are limited.$4.91$0.00$4.91$0.09
Latest Filing Detail
Jump To
Filing Snapshot
Filing Period
Jan 1, 2025 to Dec 31, 2025
Signed
Feb 17, 2026
Return Version
2025v4.0
Gross Receipts
$278,584
Mission and Program Overview

Mission

To provide educational programs on conservation.

Balance Sheet Detail
LineBeginningEndChange
Assets
Rtn Earn Endowment Incm Other Fnds$6,123,367$6,322,790▲ $199,423
Land, Buildings, and Equipment, Net$3,722,063$3,736,621▲ $14,558
Investments in Publicly Traded Securities$2,352,248$2,480,896▲ $128,648
Savings and Temporary Cash Investments$29,575$82,966▲ $53,391
Cash and Non-Interest-Bearing Accounts$19,481$22,307▲ $2,826
Pd in Cap Srpls Land Bldg Eqp Fund$0$0→ $0
Cap Stk Tr Prin Current Funds$0$0→ $0
Total Assets$6,123,367$6,322,790▲ $199,423
Liabilities
Total Liabilities$0$0→ $0
Net Assets / Fund Balance
Total Net Assets Fund Balance$6,123,367$6,322,790▲ $199,423
Total Liabilities and Net Assets / Fund Balance$6,123,367$6,322,790▲ $199,423

Asset Categories

AssetBook ValueDepreciationBasis
Land$3,583,545-$3,583,545
Buildings$137,643$299,151$436,794
Other Land Buildings$15,433$123,768$139,201
Compensation and Service Providers
Top Officer PayScore unavailable

Board Members and Trustees

NameTitle
Susan AllmanPresident
James KaltsasVice President
Bill WasherDirector
Doug SaylorDirector
Joy SweetDirector
Nat BilskyDirector
Sue KowallDirector
Susan LaugalDirector
Kristi OvergaardSecretary
Michael LevinTreasurer
Revenue and Support

Revenue Composition

Contributions and Grants
$77,530
Program Service Revenue
$21,659
Investment Income
$179,395
Other Revenue
$0
All Other Contributions
$77,530
Change in Net Assets
$121,779
Expenses and Functional Allocation

Major Expense Lines

Line ItemAmount
Salaries, Compensation, and Employee Benefits$93,356
Other Expenses$63,449
Total Fundraising Expense$6,441
Grants and Similar Amounts Paid$0
Professional Fundraising Fees$0

Functional Expense Allocation

Line ItemProgramManagementFundraisingTotal
Other Salaries and Wages$86,722--$86,722
Depreciation Depletion$11,843--$11,843
All Other Expenses$6,888--$6,888
Payroll Taxes$6,634--$6,634
Insurance$5,514--$5,514
Advertising$3,367--$3,367
Other Expenses$3,307-$6,441$3,307
Occupancy$2,471--$2,471
Fees for Services Accounting-$1,600-$1,600
Office Expenses$154--$154
Total Functional Expenses$148,764$1,600$6,441$156,805
Fundraising, Events, and Gaming
Fundraising activities
No
Gaming activities
No
Professional fundraiser used
No

Fundraising and Gaming Totals

Line ItemAmount
Professional Fundraising Fees$0
Political and Lobbying Activity
Political campaign activity
No
Lobbying activity
No
Subject to proxy tax
No
Governance and Compliance

Governance Checklist

Compiled or reviewed by an accountant
No
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
No
Other officer compensation reviewed
No
Conflict-of-interest policy
No
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 board retains the services of an independent cpa firm to prepare the organization's form 990. Management reviews the completed form 990 and provides a full copy to all voting members of the governing body prior to filing. The governing body is provided a reasonable amount of time to review the return and ask any questions directly to organization management or the contact at the independent cpa firm prior to filing.”

Form 990, Part VI, Section B, Line 15

“There is no compensation to any officers or directors. Stillman nature center's board of directors, including all officers, consists entirely of volunteers. In addition, there are no employees who meet the definition of key employees.”

Form 990, Part VI, Section C, Line 19

“Governing documents and financial statements are available through the applicable governmental agencies.”

Filing and Contact Details

Filer

Filer Name
Stillman Nature Center
EIN
36-3182273
Phone
8474286957
Address
33 WEST PENNY ROAD, SOUTH BARRINGTON, IL 60010

Signing Officer

Name
Michael Levin
Title
Treasurer
Phone
8474286957
Signed
2026-02-17
Discuss with paid preparer
Yes

Organization Details

Principal Officer
Michael Levin
Formed
1982
Legal Domicile
Il
Voting Board Members
10
Independent Board Members
10
Employees
5
Volunteers
25

Preparer

Firm
Plante & Moran Pllc
Address
10 S RIVERSIDE PLAZA 9TH FLOOR, CHICAGO, IL 60606
Preparer
Kimberly a Haumann
Phone
3122071040
Raw XML Appendix391 raw XML fields

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/BooksInCareOfDetail/PhoneNum08475200858
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IRS990/Desc0THE PURPOSE OF THIS ORGANIZATION IS TO PROVIDE FOR AND CONDUCT ENVIRONMENTAL EDUCATION CLASSES FOR GROUPS SUCH AS SCHOOL CLASSES AND THE GENERAL PUBLIC. THESE EDUCATIONAL ACTIVITIES INCLUDE SPONSORING NATURE WALKS, PUBLICIZING CONSERVATION AND MAINTAINING AN 80 ACRE PROPERTY AS NATURAL LANDSCAPE.STILLMAN NATURE CENTER CONTINUES TO MAKE ITS NATURAL LANDSCAPE ACCESSIBLE FOR ALL, INCLUDING THOSE THAT MUST BE ASSISTED BY A CAREGIVER OR OTHER DEVICE.
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IRS990/ProhibitedTaxShelterTransInd00
IRS990/PYBenefitsPaidToMembersAmt00
IRS990/PYContributionsGrantsAmt048248
IRS990/PYExcessBenefitTransInd00
IRS990/PYGrantsAndSimilarPaidAmt00
IRS990/PYInvestmentIncomeAmt0134449
IRS990/PYOtherExpensesAmt048797
IRS990/PYOtherRevenueAmt00
IRS990/PYProgramServiceRevenueAmt018688
IRS990/PYRevenuesLessExpensesAmt060644
IRS990/PYSalariesCompEmpBnftPaidAmt091944
IRS990/PYTotalExpensesAmt0140741
IRS990/PYTotalProfFndrsngExpnsAmt00
IRS990/PYTotalRevenueAmt0201385
IRS990/QuidProQuoContributionsInd00
IRS990/RcvFndsToPayPrsnlBnftCntrctInd00
IRS990/ReconcilationRevenueExpnssAmt0121779
IRS990/RelatedEntityInd00
IRS990/RelatedOrganizationCtrlEntInd00
IRS990/ReportInvestmentsOtherSecInd00
IRS990/ReportLandBuildingEquipmentInd01
IRS990/ReportOtherAssetsInd00
IRS990/ReportOtherLiabilitiesInd00
IRS990/ReportProgramRelatedInvstInd00
IRS990/RevenueAmt021659
IRS990/RtnEarnEndowmentIncmOthFndsGrp/BOYAmt06123367
IRS990/RtnEarnEndowmentIncmOthFndsGrp/EOYAmt06322790
IRS990/SavingsAndTempCashInvstGrp/BOYAmt029575
IRS990/SavingsAndTempCashInvstGrp/EOYAmt082966
IRS990ScheduleA/Form990ScheduleAPartVIGrp/ExplanationTxt0THE ORGANIZATION MEETS ALL THE REQUIREMENTS NEEDED TO QUALIFY FOR EXCEPTION UNDER REG. 1.170A-9(E)(3), AND HENCE SHOULD BE TREATED AS A "PUBLICLY SUPPORTED ORGANIZATION". THE FOLLOWING IS HOW THE ORGANIZATION SATISFIES THE EXCEPTION. 1) THE ORGANIZATION NORMALLY RECEIVES AT LEAST TEN PERCENT OF IT'S SUPPORT FROM THE PUBLIC. 2) THE ORGANIZATION IS ORGANIZED AND OPERATED TO ATTRACT NEW AND ADDITIONAL PUBLIC SUPPORT ON A CONTINOUS BASIS. 3)THE ORGANIZATIONS' GOVERNING BODY REPRESENTS BROAD INTERESTS OF THE GENERAL PUBLIC. 4)THE ORGANIZATION MAKES ITS NATURE CENTER OPEN TO THE PUBLIC ON A REGULAR BASIS, FREE OF CHARGE. 5)MEMBERSHIP DUES ARE DESIGNED TO ENROLL A SUBSTANTIAL NUMBER OF PERSONS IN THE COMMUNITY, OFFERRED FOR AS LITTLE AS $20.
IRS990ScheduleA/Form990ScheduleAPartVIGrp/FormAndLineReferenceDesc0SCHEDULE A, PART II
IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearAmt077530
IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus1YearAmt048248
IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus2YearsAmt037302
IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus3YearsAmt039001
IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus4YearsAmt033634
IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/TotalAmt0235715
IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearAmt0179395
IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus1YearAmt0134449
IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus2YearsAmt078612
IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus3YearsAmt0106618
IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus4YearsAmt0108058
IRS990ScheduleA/GrossInvestmentIncome170Grp/TotalAmt0607132
IRS990ScheduleA/GrossReceiptsRltdActivitiesAmt075767
IRS990ScheduleA/PublicOrganization170Ind0X
IRS990ScheduleA/PublicSupportCY170Pct00.23540
IRS990ScheduleA/PublicSupportPY170Pct00.25960
IRS990ScheduleA/PublicSupportTotal170Amt0198429
IRS990ScheduleA/SubstantialContributorsTotAmt037286
IRS990ScheduleA/TenPctFactsCrcmstncsTestCYInd0X
IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearAmt077530
IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus1YearAmt048248
IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus2YearsAmt037302
IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus3YearsAmt039001
IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus4YearsAmt033634
IRS990ScheduleA/TotalCalendarYear170Grp/TotalAmt0235715
IRS990ScheduleA/TotalSupportAmt0842847
IRS990ScheduleB/ContributorInformationGrp/ContributorBusinessName/BusinessNameLine10RESTRICTED
IRS990ScheduleB/ContributorInformationGrp/ContributorNum0RESTRICTED
IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/AddressLine10RESTRICTED
IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/AddressLine20RESTRICTED
IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/City0RESTRICTED
IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/State0RESTRICTED
IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/ZIPCode0RESTRICTED
IRS990ScheduleB/ContributorInformationGrp/TotalContributionsAmt0RESTRICTED
IRS990/ScheduleBRequiredInd01
IRS990ScheduleD/BuildingsGrp/BookValueAmt0137643
IRS990ScheduleD/BuildingsGrp/DepreciationAmt0299151
IRS990ScheduleD/BuildingsGrp/OtherCostOrOtherBasisAmt0436794
IRS990ScheduleD/LandGrp/BookValueAmt03583545
IRS990ScheduleD/LandGrp/OtherCostOrOtherBasisAmt03583545
IRS990ScheduleD/OtherLandBuildingsGrp/BookValueAmt015433
IRS990ScheduleD/OtherLandBuildingsGrp/DepreciationAmt0123768
IRS990ScheduleD/OtherLandBuildingsGrp/OtherCostOrOtherBasisAmt0139201
IRS990ScheduleD/TotalBookValueLandBuildingsAmt03736621
IRS990/ScheduleJRequiredInd00
IRS990/ScheduleORequiredInd01
IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt0THE BOARD RETAINS THE SERVICES OF AN INDEPENDENT CPA FIRM TO PREPARE THE ORGANIZATION'S FORM 990. MANAGEMENT REVIEWS THE COMPLETED FORM 990 AND PROVIDES A FULL COPY TO ALL VOTING MEMBERS OF THE GOVERNING BODY PRIOR TO FILING. THE GOVERNING BODY IS PROVIDED A REASONABLE AMOUNT OF TIME TO REVIEW THE RETURN AND ASK ANY QUESTIONS DIRECTLY TO ORGANIZATION MANAGEMENT OR THE CONTACT AT THE INDEPENDENT CPA FIRM PRIOR TO FILING.
IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt1THERE IS NO COMPENSATION TO ANY OFFICERS OR DIRECTORS. STILLMAN NATURE CENTER'S BOARD OF DIRECTORS, INCLUDING ALL OFFICERS, CONSISTS ENTIRELY OF VOLUNTEERS. IN ADDITION, THERE ARE NO EMPLOYEES WHO MEET THE DEFINITION OF KEY EMPLOYEES.
IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt2GOVERNING DOCUMENTS AND FINANCIAL STATEMENTS ARE AVAILABLE THROUGH THE APPLICABLE GOVERNMENTAL AGENCIES.
IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc0FORM 990, PART VI, SECTION B, LINE 11B
IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc1FORM 990, PART VI, SECTION B, LINE 15
IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc2FORM 990, PART VI, SECTION C, LINE 19
IRS990/SchoolOperatingInd00
IRS990/SignificantChangeInd00
IRS990/SignificantNewProgramSrvcInd00
IRS990/StatesWhereCopyOfReturnIsFldCd0IL
IRS990/SubjectToExcsTaxNetInvstIncInd00
IRS990/SubjectToProxyTaxInd00
IRS990/SubjToTaxRmnrtnExPrchtPymtInd00
IRS990/TaxablePartyNotificationInd00
IRS990/TaxExemptBondsInd00
IRS990/TerminateOperationsInd00
IRS990/TotalAssetsBOYAmt06123367
IRS990/TotalAssetsEOYAmt06322790
IRS990/TotalAssetsGrp/BOYAmt06123367
IRS990/TotalAssetsGrp/EOYAmt06322790
IRS990/TotalCompGreaterThan150KInd00
IRS990/TotalContributionsAmt077530
IRS990/TotalEmployeeCnt05
IRS990/TotalFunctionalExpensesGrp/FundraisingAmt06441
IRS990/TotalFunctionalExpensesGrp/ManagementAndGeneralAmt01600
IRS990/TotalFunctionalExpensesGrp/ProgramServicesAmt0148764
IRS990/TotalFunctionalExpensesGrp/TotalAmt0156805
IRS990/TotalGrossUBIAmt00
IRS990/TotalLiabilitiesBOYAmt00
IRS990/TotalLiabilitiesEOYAmt00
IRS990/TotalLiabilitiesGrp/BOYAmt00
IRS990/TotalLiabilitiesGrp/EOYAmt00
IRS990/TotalNetAssetsFundBalanceGrp/BOYAmt06123367
IRS990/TotalNetAssetsFundBalanceGrp/EOYAmt06322790
IRS990/TotalOtherCompensationAmt00
IRS990/TotalProgramServiceExpensesAmt0148764
IRS990/TotalProgramServiceRevenueAmt021659
IRS990/TotalReportableCompFromOrgAmt00
IRS990/TotalRevenueGrp/ExclusionAmt0179395
IRS990/TotalRevenueGrp/RelatedOrExemptFuncIncomeAmt021659
IRS990/TotalRevenueGrp/TotalRevenueColumnAmt0278584
IRS990/TotalRevenueGrp/UnrelatedBusinessRevenueAmt00
IRS990/TotalVolunteersCnt025
IRS990/TotLiabNetAssetsFundBalanceGrp/BOYAmt06123367
IRS990/TotLiabNetAssetsFundBalanceGrp/EOYAmt06322790
IRS990/TotReportableCompRltdOrgAmt00
IRS990/TrnsfrExmptNonChrtblRltdOrgInd00
IRS990/TypeOfOrganizationCorpInd0X
IRS990/UnrelatedBusIncmOverLimitInd00
IRS990/UponRequestInd0X
IRS990/USAddress/AddressLine1Txt033 WEST PENNY ROAD
IRS990/USAddress/CityNm0SOUTH BARRINGTON
IRS990/USAddress/StateAbbreviationCd0IL
IRS990/USAddress/ZIPCd060010
IRS990/VotingMembersGoverningBodyCnt010
IRS990/VotingMembersIndependentCnt010
IRS990/WebsiteAddressTxt0WWW.STILLMANNC.ORG
IRS990/WhistleblowerPolicyInd00
ReturnHeader/BuildTS02025-03-06 01:10:19Z
ReturnHeader/BusinessOfficerGrp/DiscussWithPaidPreparerInd01
ReturnHeader/BusinessOfficerGrp/PersonNm0MICHAEL LEVIN
ReturnHeader/BusinessOfficerGrp/PersonTitleTxt0TREASURER
ReturnHeader/BusinessOfficerGrp/PhoneNum08474286957
ReturnHeader/BusinessOfficerGrp/SignatureDt02026-02-17
ReturnHeader/Filer/BusinessName/BusinessNameLine1Txt0STILLMAN NATURE CENTER
ReturnHeader/Filer/BusinessNameControlTxt0STIL
ReturnHeader/Filer/EIN0363182273
ReturnHeader/Filer/PhoneNum08474286957
ReturnHeader/Filer/USAddress/AddressLine1Txt033 WEST PENNY ROAD
ReturnHeader/Filer/USAddress/CityNm0SOUTH BARRINGTON
ReturnHeader/Filer/USAddress/StateAbbreviationCd0IL
ReturnHeader/Filer/USAddress/ZIPCd060010
ReturnHeader/PreparerFirmGrp/PreparerFirmEIN0331498605
ReturnHeader/PreparerFirmGrp/PreparerFirmName/BusinessNameLine1Txt0PLANTE & MORAN PLLC
ReturnHeader/PreparerFirmGrp/PreparerUSAddress/AddressLine1Txt010 S RIVERSIDE PLAZA 9TH FLOOR
ReturnHeader/PreparerFirmGrp/PreparerUSAddress/CityNm0CHICAGO
ReturnHeader/PreparerFirmGrp/PreparerUSAddress/StateAbbreviationCd0IL
ReturnHeader/PreparerFirmGrp/PreparerUSAddress/ZIPCd060606
ReturnHeader/PreparerPersonGrp/PhoneNum03122071040
ReturnHeader/PreparerPersonGrp/PreparationDt02026-02-17
ReturnHeader/PreparerPersonGrp/PreparerPersonNm0KIMBERLY A HAUMANN
ReturnHeader/ReturnTs02026-03-25T09:22:51-05:00
ReturnHeader/ReturnTypeCd0990
ReturnHeader/TaxPeriodBeginDt02025-01-01
ReturnHeader/TaxPeriodEndDt02025-12-31
ReturnHeader/TaxYr02025

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