| 2023 | Inland Empire Railway Historical Society | 990 | National Rep | 40 | $0 | $0 | View return |
| 2022 | Inland Empire Railway Historical Society | 990 | National Rep | 40 | $0 | $0 | View return |
| 2022 | National Railway Historical Society Inc. | 990 | Director | 1 | $0 | $0 | View return |
| 2021 | National Railway Historical Society Inc. | 990 | Director | 1 | $0 | $0 | View return |
| 2021 | Inland Empire Railway Historical Society | 990 | National Rep | 40 | $0 | $0 | View return |
| 2020 | Inland Empire Railway Historical Society | 990 | National Rep | 40 | $0 | $0 | View return |
| 2019 | James R & Donna H Simanton Foundation | 990PF | VP/Secretary/Manager/Direc | 1 | $0 | $0 | View return |
| 2019 | Inland Empire Railway Historical Society | 990 | National Rep | 15 | $0 | $0 | View return |
| 2018 | James R & Donna H Simanton Foundation | 990PF | VP/Secretary/Manager/Direc | 1 | $0 | $0 | View return |
| 2018 | Inland Empire Railway Historical Society | 990 | Natl Director | 15 | $0 | $0 | View return |
| 2017 | Inland Empire Railway Historical Society | 990 | Natl Director | 15 | $0 | $0 | View return |
| 2017 | James R & Donna H Simanton Foundation | 990PF | VP/Secretary/Manager/Direc | 1 | $0 | $0 | View return |
| 2016 | James R & Donna H Simanton Foundation | 990PF | VP/Secretary/Manager/Direc | 20 | $35,970 | $3,037 | View return |
| 2016 | Inland Empire Railway Historical Society | 990 | Natl Director | 15 | $0 | $0 | View return |
| 2015 | James R & Donna H Simanton Foundation | 990PF | VP/Secretary/Manager/Direc | 20 | $44,990 | $17,314 | View return |
| 2015 | Inland Empire Railway Historical Society | 990 | Natl Director | 15 | $0 | $0 | View return |
| 2014 | James R & Donna H Simanton Foundation | 990PF | VP/Secretary/Manager/Direc | 20 | $44,990 | $20,542 | View return |
| 2014 | Inland Empire Railway Historical Society | 990 | Natl Director | 15 | $0 | $0 | View return |
| 2013 | James R & Donna H Simanton Foundation | 990PF | VP/Secretary/Manager/Direc | 20 | $44,990 | $18,516 | View return |
| 2013 | Inland Empire Railway Historical Society | 990 | Natl Director | 15 | $0 | $0 | View return |
| 2012 | James R & Donna H Simanton Foundation | 990PF | VP/Secretary/Manager/Direc | 20 | $44,990 | $13,515 | View return |
| 2011 | James R & Donna H Simanton Foundation | 990PF | VP/Secretary/Manager/Direc | 20 | $44,990 | $15,192 | View return |