Publication 417, Nonprofit USPS Marketing Mail Eligibility: Nonprofit and Other Qualified Organizations > 3 Application for Authorization > 3-2 Additional Mailing Offices
Once an organization is authorized, it may mail at Nonprofit USPS Marketing Mail prices at any Post Office location that accepts presorted mailings within the United States. The Postal Service will issue a national Nonprofit USPS Marketing Mail authorization number to each organization authorized to mail at the Nonprofit USPS Marketing Mail prices. Authorized organizations must display this number in the appropriate space on each postage statement that accompanies a mailing at Nonprofit USPS Marketing Mail prices.
