Many U.S. citizens do not realize that if they have “sponsored” a non-citizen to become a permanent resident of the United States (i.e. submitted a Form I-864 Affidavit of Support), then the U.S. citizen must notify USCIS of their new address each time they move.
If the adjustment of status case is still pending, the U.S. citizen can make a change of address on pending cases via the USCIS Online Change of Address page or by calling 1-800-375-5283. https://egov.uscis.gov/coa/displayCOAForm.do
If there is no pending case with USCIS, the U.S citizen must complete Form I-865 within thirty days of moving.
Contact Sterling Law if you need assistance changing your address with USCIS. 231-486-0559 / sterlinglawoffice.net