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Castro Valley, California

Amateur sports nonprofits in Castro Valley, CA

15 tax-exempt amateur sports nonprofits based in Castro Valley, from IRS data.

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Swimming and water sports

East Bay Swim League

Castro Valley, CA 94546

Tax-exempt since 2026 · EIN 20-8294487

Baseball and softball

Extreme Baseball

Castro Valley, CA 94546

Tax-exempt since 2021 · EIN 30-0857444

Equestrian

Who Rescues Who

Castro Valley, CA 94546

Tax-exempt since 2018 · EIN 81-1788707

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Licensed child care and after-school programs in Castro Valley · 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.