| George Mason University Foundation Inc | 501(c)(3) | 1992 | $116.4 million | $554.3 million | 2025-06 |
| The J127 Education Foundation | 501(c)(3) | 1989 | $18.1 million | $18.8 million | 2025-06 |
| Trinity Christian School of Fairfax | 501(c)(3) | 1988 | $17.2 million | $29.5 million | 2025-06 |
| Mason Korea LLC | 501(c)(3) | 2014 | $15.8 million | $12.5 million | 2025-12 |
| Washington Institute for Education and Research | 501(c)(3) | 2023 | $9.6 million | $108.1 million | 2025-05 |
| Peterson Family Foundation II Inc | 501(c)(3) | 2008 | $5.2 million | $16,482 | 2025-12 |
| Gesher School Inc | 501(c)(3) | 1983 | $5.1 million | $9 million | 2025-06 |
| Fairfax University of America | 501(c)(3) | 2000 | $4.8 million | $17.1 million | 2024-12 |
| Nonprofit New School of Northern Virginia Inc | 501(c)(3) | 2018 | $4.3 million | $10.5 million | 2025-08 |
| The George Mason University Instructional Foundation Inc | 501(c)(3) | 1966 | $2 million | $18.4 million | 2025-03 |
| The Side-Out Foundation | 501(c)(3) | 2005 | $1.5 million | $2.1 million | 2025-03 |
| Montessori School of Oakton Inc | 501(c)(3) | 1983 | $1.4 million | $831,191 | 2025-06 |
| Palm Tree School | 501(c)(3) | 2011 | $1.1 million | $2.5 million | 2024-12 |
| American Foundation for Pharmaceutical Education | 501(c)(3) | 1943 | $952,827 | $12.1 million | 2025-12 |
| The Rvda Education Foundation | 501(c)(3) | 1993 | $878,082 | $1.6 million | 2025-06 |
| The Character Education Partnership Inc | 501(c)(3) | 1993 | $833,515 | $352,532 | 2024-12 |
| National Association of Landscape Professionals Foundation I Inc | 501(c)(3) | 1998 | $804,193 | $5.5 million | 2025-09 |
| Wakiya Foundation Inc | 501(c)(3) | 2022 | $600,000 | $145,251 | 2024-12 |
| Fairfax Futures | 501(c)(3) | 2005 | $560,895 | $214,143 | 2025-12 |
| Fairfax Library Foundation Inc | 501(c)(3) | 1995 | $542,022 | $8 million | 2025-06 |
| St Anthonys Academy Limited | 501(c)(3) | 2023 | $487,655 | $137,544 | 2025-08 |
| George Mason University Alumni Association | 501(c)(3) | 1977 | $486,942 | $673,468 | 2025-06 |
| Adiuvare Foundation | 501(c)(3) | 2020 | $430,000 | $435,546 | 2025-12 |
| George Mason Research Foundation Inc | 501(c)(3) | 2008 | $338,675 | $983,922 | 2025-06 |
| City of Fairfax Band Association Inc | 501(c)(3) | 1995 | $297,338 | $906,902 | 2026-06 |
| Fairfax High School Athletic Boosters Club Inc | 501(c)(3) | 2021 | $271,705 | $291,905 | 2025-06 |
| Pardada Pardadi Educational Society Inc | 501(c)(3) | 2003 | $261,350 | $15,246 | 2025-12 |
| W T Woodson Choral Boosters Inc | 501(c)(3) | 2001 | $197,934 | $56,692 | 2025-06 |
| Northern Virginia Wrestling Club | 501(c)(3) | 2016 | $140,533 | $36,528 | 2025-12 |
| CG Woodson High School Rowing Boosters Association Inc | 501(c)(3) | 1988 | $139,345 | $229,746 | 2025-06 |
| Conflict Resolution & Conciliationcenter Inc | 501(c)(3) | 2007 | $135,134 | $39,291 | 2025-12 |
| Navy Elementary School Pto | 501(c)(3) | 2008 | $112,686 | $109,890 | 2025-06 |
| University of Science & Technology of China Washington Fund | 501(c)(3) | 2018 | $97,569 | $201,396 | 2025-12 |
| Virginia Congress of Parents and Teachers | 501(c)(3) | 1985 | $94,408 | $62,986 | 2026-06 |
| Merritt Academy Parent Teacher Organization | 501(c)(3) | 2005 | $93,991 | $154,104 | 2026-06 |
| WT Woodson High School Ptso Inc | 501(c)(3) | 2011 | $77,805 | $70,253 | 2025-06 |
| Ballet Arts Ensemble of Fairfax Inc | 501(c)(3) | 2001 | $72,335 | $49,705 | 2024-12 |
| Citizens in Charge Foundation | 501(c)(3) | 2000 | $69,985 | $32,180 | 2024-12 |
| Chi Omega Fraternity | 501(c)(7) | 1940 | $68,715 | $119,560 | 2025-06 |
| National Stem Talent Initiative | 501(c)(4) | 2026 | $50,000 | $9,849 | 2025-12 |
| Center for International Virtual Schooling C4ivs | 501(c)(3) | 2012 | $29,820 | $0 | 2024-12 |
| North Tier Partnership | 501(c)(3) | 2013 | $24,490 | $31,768 | 2025-12 |
| Committee of One Million | 501(c)(4) | 1999 | $15,886 | $493,187 | 2025-12 |
| Maryland Society of Surveyors Educational Trust | 501(c)(3) | 2004 | $14,502 | $50,850 | 2025-09 |
| National Capital Area Chapter West Virginia University Alumni Assoc | 501(c)(3) | 2012 | $9,176 | $14,496 | 2025-05 |
| 123 Club | 501(c)(3) | 2024 | | $27,267 | 2024-12 |
| 4 A Rainy Day | 501(c)(3) | 2026 | $0 | $0 | 2021-12 |
| 4 Positive Choices Inc | 501(c)(3) | 2001 | $0 | $0 | 2025-12 |
| Africa Reading House Inc | 501(c)(3) | 2018 | $0 | $0 | 2025-12 |
| Afsirernessa Memorial Foundation | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Ai Atlarge Inc | 501(c)(3) | 2026 | | | |
| Airborne Robotics Alliance | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Alumni Corporation of Alpha Omega Delta of Chi Psi | 501(c)(7) | 2007 | $0 | $0 | 2026-06 |
| Appletree Pto | 501(c)(3) | 2010 | $0 | $0 | 2026-06 |
| Ascent Learning Center | 501(c)(3) | 2022 | $0 | $0 | 2025-06 |
| Asian American Law Enforcement Association | 501(c)(3) | 2015 | $0 | $0 | 2025-12 |
| Asian Leadership Alliance | 501(c)(3) | 2023 | $0 | $0 | 2026-06 |
| Atlasautoware | 501(c)(3) | 2022 | $0 | $0 | 2026-06 |
| Ballou Knights4life Scholarship Foundation Inc | 501(c)(3) | 2021 | $0 | $0 | 2024-12 |
| Bliss Global | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| Cancer Help Eat Well | 501(c)(3) | 2011 | $0 | $0 | 2025-12 |
| Chinese Nesta Inc | 501(c)(3) | 2010 | $0 | $0 | 2025-12 |
| Club Softball at George Mason University | 501(c)(3) | 2023 | $0 | $0 | 2025-05 |
| Community Block Initiative | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Cquestrators Inc | 501(c)(3) | 2022 | $0 | $0 | 2023-05 |
| Development Effectiveness Ministry | 501(c)(3) | 2010 | $0 | $0 | 2025-12 |
| Dlac Bridges | 501(c)(3) | 2026 | | | |
| Dollar Scholars Foundation | 501(c)(3) | 2024 | $0 | $0 | 2026-06 |
| Eagle Online Academy | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Easeeducates Inc | 501(c)(3) | 2026 | | | |
| Eukairos Collective | 501(c)(3) | 2026 | $0 | $0 | 2025-12 |
| Evolve Empowerment Initiative Inc | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| FHS Theatre Boosters | 501(c)(3) | 2017 | $0 | $0 | 2026-07 |
| Fairfax Academy Musical Theatre and Actors Studio Boosters | 501(c)(3) | 2025 | | | |
| Fairfax Education Association Mimi Dash Scholarship Fund | 501(c)(3) | 2020 | $0 | $0 | 2024-12 |
| Fairfax Free Book Bus | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Fairfax Gymnastics Academy Girls Booster Club | 501(c)(3) | 2016 | $0 | $0 | 2026-06 |
| Fairfax High School Band Boosters | 501(c)(3) | 1999 | $0 | $0 | 2025-06 |
| Fairfax High School Choral Patrons Association | 501(c)(3) | 2020 | | $21,422 | 2025-07 |
| Fairfax Secular Homeschool Collecti Ve | 501(c)(3) | 2026 | $0 | $0 | 2026-06 |
| Filipino Cultural Association of George Mason University | 501(c)(3) | 2022 | $0 | $0 | 2024-12 |
| G Tax | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| GRF Foundation | 501(c)(3) | 2021 | $0 | $0 | 2025-12 |
| Gift of Education | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| Harris Goodall Squires Memorial Scholarship Foundation | 501(c)(3) | 2019 | | $38,250 | 2025-12 |
| Headway Initiative | 501(c)(3) | 2016 | $0 | $0 | 2025-12 |
| Historical Society of Fairfax County Inc | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Hong Dance Foundation | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Inquisiminds | 501(c)(3) | 2025 | | | |
| Insight Preprofessional Program | 501(c)(3) | 2006 | $0 | $0 | 2024-12 |
| International Aviation Safety Foundation | 501(c)(3) | 2018 | $0 | $0 | 2025-12 |
| Isa Pto | 501(c)(3) | 2026 | | | |
| Isabelle Williams Education Initiative Inc | 501(c)(3) | 2018 | $0 | $0 | 2023-12 |
| John Donohue Foundation | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Julia Campbell Memorial Foundationinc | 501(c)(3) | 2007 | $0 | $0 | 2024-12 |
| Ka Christian Scholarship Foundation Inc | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| Knowledge Augmentation Initiative | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Lapis Social and Cultural Association Inc | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Learning Development Institute | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Let Her Shine | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Little Flock Christian School | 501(c)(3) | 2006 | | | |
| Marie Maxey Foundation | 501(c)(3) | 2018 | $0 | $0 | 2025-12 |
| Mitceo Inc | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Mt Calvary Baptist Church | 501(c)(3) | 2016 | | | |
| My Conscious | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| National Council for the Promotionof the Italian Language in American | 501(c)(3) | 2007 | $0 | $0 | 2026-06 |
| Our Cause Education and Scholarship Foundation | 501(c)(3) | 2019 | $0 | $0 | 2026-03 |
| Parent Booster USA Inc | 501(c)(3) | 2005 | $0 | $0 | 2026-07 |
| Parent Booster USA Inc | 501(c)(3) | 2005 | $0 | $0 | 2025-06 |
| Rashid Family Foundation Inc | 501(c)(3) | 2022 | | $78,594 | 2025-12 |
| Robinson Secondary School Parent Teacher Student Organization | 501(c)(3) | 2018 | $0 | $0 | 2025-06 |
| Rotary Club of Falls Church Foudation Inc | 501(c)(3) | 1993 | $0 | $0 | 2024-07 |
| Rushi Fund | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| SBTS Korean Alumniassociation | 501(c)(3) | 2026 | | | |
| Safe Haven-Sd | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Saharco Foundation | 501(c)(3) | 2020 | | $254,936 | 2024-12 |
| Seedling Inc | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Sudanese Student Organization at Virginia Tech | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| TPN Inc | 501(c)(3) | 2015 | $0 | $0 | 2024-12 |
| Technology and Media Council for Exceptional Children Inc | 501(c)(3) | 1997 | $0 | $0 | 2025-12 |
| The Art of Being A Woman Foundation | 501(c)(3) | 2026 | | | |
| The Sana Foundation | 501(c)(3) | 2026 | | | |
| The Volya Project | 501(c)(3) | 2026 | | | |
| Tke Mu Omega Alumni Association Inc | 501(c)(7) | 2026 | $0 | $0 | 2025-12 |
| Transdisciplinary Research Union for the Study of Trust | 501(c)(3) | 2026 | | | |
| University of Santo Tomas Alumni Association in America Inc | 501(c)(3) | 2013 | $0 | $0 | 2025-12 |
| Us Azeris Network | 501(c)(4) | 2010 | $0 | $0 | 2025-12 |
| Us Chapter of Ican | 501(c)(3) | 2018 | $0 | $0 | 2025-12 |
| Virginia Association of School Certifying Officials | 501(c)(3) | 2019 | $0 | $0 | 2024-07 |
| Virginia Congress of Parents and Teachers | 501(c)(3) | 1985 | $0 | $0 | 2026-06 |
| Virginia Congress of Parents and Teachers | 501(c)(3) | 1985 | $0 | $0 | 2026-06 |
| Virginia Congress of Parents and Teachers | 501(c)(3) | 1985 | $0 | $0 | 2026-06 |
| Vishnu Murthy Foundation Inc | 501(c)(3) | 2022 | | $48,851 | 2025-12 |
| WTW Orchestra Boosters | 501(c)(3) | 2022 | $0 | $0 | 2025-06 |
| Washington - Anacostia Squadron Inc | 501(c)(3) | 2020 | $0 | $4,958 | 2025-12 |
| Wiced of Va | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Woodson Precisionettes Dance Team | 501(c)(3) | 2026 | | | |
| World Missions College of the Greater Washington | 501(c)(3) | 2007 | | | |
| Wto Foundation | 501(c)(3) | 2025 | $0 | $23,427 | 2025-02 |
| XRJ Foundation | 501(c)(3) | 2024 | | | |
| Yanzhong Oversea Alumni Association | 501(c)(3) | 2017 | $0 | $0 | 2025-07 |
| Yw Kang Foundation for Visually Impaired Inc | 501(c)(3) | 2018 | $0 | $0 | 2025-12 |