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  1. Search for tax exempt organizations | Internal Revenue Service

  2. Tax Exempt Organization Search | Internal Revenue Service

  3. Tax Exempt Organization Search | Internal Revenue Service - IRS …

  4. Find nonprofits | GuideStar | Candid

  5. Nonprofit data for donors, grantmakers, and businesses

  6. Charities and nonprofits | Internal Revenue Service

  7. Nonprofit Explorer - ProPublica

  8. 990 Finder | Research and verify nonprofits - Candid

  9. How to Verify the 501(c)(3) Status of a Nonprofit Organization - wikiHow

  10. Pennsylvania Nonprofit Organizations - 501c3 Lookup | TRUiC