[Q] After I submit I-526 or I-829, if I move to another U.S. address, how should I notify USCIS?
You must notify USCIS as follows, per a recent notice by USCIS:
Beginning March 15, 2011 all Change of Address, (Form AR-11) and Alien’s Change of Address, (Form AR-11 SR) will change filing locations. Now, you must file all change of address forms at the following address:
Harrisonburg File Storage Facility
1344 Pleasants Drive
Harrisonburg, VA 22801
Change of address forms mailed to the old location will be forwarded to the new filing location for 45 days beginning March 15, 2011 until April 28, 2011.
You also have the option of notifying USCIS of a change of address online. To change your address online or for more information about USCIS and our programs, visit us at www.uscis.gov.
More specifically, the online link to change address is: https://egov.uscis.gov/crisgwi/go?action=coa.Terms