Form 990-PF can be filed by paper or by electronically. IRS recommends Nonprofits to file 990-PF electronically. Visit https://www.expresstaxexempt.com/form-990-pf/form-990-pf-mailing-address-for-private-foundations/ to learn more about 990-PF mailing address. But if you choose to mail your Form 990-PF to the IRS, be sure that tax-exempt organizations are filing returns to the Internal Revenue Service Center Ogden, Utah 84201-0027. For faster filing of Form 990-PF, be sure to e-file with one of the IRS Authorized e-file provider ExpressTaxExempt.