# First Base Foundation

Baseball and softball nonprofit in Mill Valley, California 94941. EIN 37-1499235. Data as of November 8, 2026.

Page: https://backpr.com/find/nonprofit/371499235-first-base-foundation

## IRS facts

- Type: Baseball and softball (IRS activity code N63)
- Tax status: 501(c)(3), contributions deductible, recognized 2005
- Source: IRS Business Master File, posted October 13, 2026: https://www.irs.gov/charities-non-profits/exempt-organizations-business-master-file-extract-eo-bmf

## How it compares

- Revenue rank: 5 of 10 amateur sports nonprofits in Mill Valley.
- Revenue $80,885 is higher than roughly 20 to 30% of 2,432 amateur sports nonprofits in California; median $143,571.
- Source: IRS Business Master File, posted October 13, 2026; BackPR analysis.

## Local context

- Marin County, California: about 47,838 children under 18 (U.S. Census Bureau, July 1, 2024): https://www2.census.gov/programs-surveys/popest/datasets/2020-2024/counties/asrh/cc-est2024-agesex-all.csv
- 184 youth and community nonprofits in this directory in the county: 3.8 per 1,000 children.
- Licensed programs in Mill Valley: 14 licensed child care centers, 4 school-age programs: https://backpr.com/find/california/mill-valley
- California rules: https://backpr.com/resources/states/california

## Questions

**What is First Base Foundation's EIN?**

First Base Foundation's EIN (Employer Identification Number) is 37-1499235. It is the nine-digit number the IRS uses to identify the organization. Source: IRS Exempt Organizations Business Master File posted October 13, 2026.

**Is First Base Foundation a nonprofit?**

Yes. The IRS lists First Base Foundation in Mill Valley, California as tax-exempt under section 501(c)(3), recognized since 2005. This is from the IRS Business Master File posted October 13, 2026. Status can change, so check its current status on the IRS Tax Exempt Organization Search before you donate.

**Are donations to First Base Foundation tax-deductible?**

Yes, the IRS lists gifts to First Base Foundation as tax-deductible (IRS Business Master File posted October 13, 2026). How much you can deduct depends on your own taxes, and this is not tax advice. Check its current status on the IRS Tax Exempt Organization Search before you donate.

**What does First Base Foundation do?**

The IRS classifies First Base Foundation as: Baseball and softball. It has not filed a Form 990 or 990-EZ with a mission statement that we have loaded.

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Data as of November 8, 2026. Sources: IRS Business Master File, IRS Form 990 series e-file data, U.S. Census Bureau. No officer or staff names are published.