Is Mainframe a legitimate nonprofit?

Yes. Mainframe is a 501(c)(4) organization registered with the U.S. Internal Revenue Service under EIN 39-2215232, based in Portland, Maine.

What is Mainframe's EIN?

Mainframe's Employer Identification Number (EIN) is 39-2215232.

Mainframe

501(c)(4)Civil Rights

Mainframe is a 501(c)(4) organization based in Portland, Maine, registered in 2025.

Po Box 4224, Portland, ME, 04101 EIN 39-2215232 Since 2025

Revenue

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Civil Rights median: $332K

Expenses

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Net assets

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Employees

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Contact & location

Address: Po Box 4224, Portland, ME, 04101
City: Portland
State: Maine
Category: Civil Rights, Social Action & Advocacy
Subcategory: Alliances, Advocacy & Professional Societies

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Frequently asked questions

Is Mainframe a legitimate nonprofit?: Yes. Mainframe is a 501(c)(4) organization registered with the U.S. Internal Revenue Service under EIN 39-2215232, based in Portland, Maine.
What is Mainframe's EIN?: Mainframe's Employer Identification Number (EIN) is 39-2215232.

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Data for Mainframe (EIN 39-2215232) comes from the IRS Business Master File and e-filed Form 990 returns, via CharityIndex. Figures reflect what the organization reported to the IRS for each fiscal year.