Contact the Massachusetts State Supplement Program (SSP)

There are many ways to contact the State Supplement Program (SSP) including phone, fax, or mail.

You can contact the State Supplement Program (SSP) by phone, fax, or mail. Business hours for the SSP Client Assistance Line are from 8:15 a.m. to 4:45 p.m., Monday through Friday.

If you have questions about your federal Social Security benefits (SSI), you must contact the Social Security Administration directly by phone at (800) 772-1213.

By phone

State Supplement Program (SSP) Client Assistance Line: (877) 863-1128.

The hours are 8:15 a.m. to 4:45 p.m. from Monday to Friday.

By fax

State Supplement Program (SSP) fax number: (857) 323-8310.

By mail

The State Supplement Program (SSP) mailing address is:

Massachusetts State Supplement Program
PO Box 4018
Taunton, MA 02780-0315

Please do not send checks to this address. Call the State Supplement Program Assistance Line for information about where to send a check.

Contact the Supplemental Security Income (SSI) program

The Supplemental Security Income (SSI) program is run by the federal Social Security Administration (SSA).

You can reach the SSA by phone at (800) 772-1213.

Additional Resources

Contact   for Contact the Massachusetts State Supplement Program (SSP)


(857) 323-8310


Mailing address
PO Box 4018, Taunton, MA 02780-0315

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