Use their online tools to quickly find out, or call them toll-free:
Fannie Mae
Loan Look-up Tool:
Call: 800-7FANNIE (8 am to 8 pm ET)
Freddie Mac
Loan Look-up Tool:
Call: 800-FREDDIE (8 am to 8 pm ET)
Note: Be sure and check your address on both the Fannie Mae and Freddie Mac look-up tool. If your address does not appear in the look-up tool of either site, your loan may not be owned by Fannie Mae or Freddie Mac. Eligibility criteria are for guidance only. Contact your mortgage servicer to see if you are eligible for HARP.