From the IRS and our friends at The United Way of Southeastern Pennsylvania:
The IRS publishes a list of organizations that have had their federal tax-exempt status automatically revoked for failing to file an annual information return or notice with the IRS for three consecutive years. The Automatic Revocation of Exemption List (Auto-Revocation List) provides the organization's name, employer identification number (EIN), organization (subsection) code, last known address, effective date of revocation, and the date the organization's name was posted on IRS.gov.You can download the list of Pennsylvania organizations in Excel or Adobe Acrobat.
The list will be updated monthly as organizations lose their tax-exempt status for not filing. Additional updates will be made as necessary. The date at the bottom of this web page indicates when this page was last updated.