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San Mateo, California

Amateur sports nonprofits in San Mateo, CA

17 tax-exempt amateur sports nonprofits based in San Mateo, from IRS data.

By type

Amateur sports17Youth development10PTA and PTO2Children's and youth services2Child care2Recreation and clubs1Arts education1

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Swimming and water sports

Ac Water Polo Inc

San Mateo, CA 94402

Tax-exempt since 2022 · EIN 87-1002890

Also in San Mateo

Licensed child care and after-school programs in San Mateo · California program rules

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Source: IRS Exempt Organizations Business Master File, posted October 13, 2026. We list 501(c)(3) organizations whose IRS activity code is youth development, amateur sports, camps and recreation, parent-teacher groups, children's services, child day care or arts education. We show the city and ZIP code only, never a street address or contact person. A listing is not an endorsement.