All aliens (non US citizens) who are required to be registered are also required to keep the USCIS informed of their current address, within 10 days of changing the address. It is also mandatory for "special registrant" aliens.

It is especially important when you have a application or petition pending with USCIS and wait to get notification of a decision.

Additionally, USCIS may need to contact you to provide other issued documents or return original copies of evidence you submitted.

Exceptions: Aliens exempt from this requirement are diplomats (A visa), official government representatives to an international organization (G visa), and certain nonimmigrants who do not possess a visa and who are in the US for less than 30 days.

You can file Form AR-11 online at USCIS web site. This is the easiest and most convenient option. You get the confirmation immediately. Keep that confirmation for your records as a proof.

Alternatively, file Form AR11, Alien's Change of Address Card to

For U.S. postal service deliveries:

U.S. Department of Homeland Security
USCIS
Change of Address
P. O. Box 7134
London, KY 40742-7134

For non-U.S. postal service deliveries (e.g., private couriers):

U.S. Department of Homeland Security
USCIS
Change of Address
1084-I South Laurel Road
London, KY 40744

There is no fee to file this form. And you don't have to send any other supporting documents, photographs or anything else with the form. Only the form is required.

Note: special registrant aliens should file Form AR-11SR instead.

• Use certified, registered or receipt mail that will give you proof that you indeed mailed the form just case there is any problem in the future.
  Adding extra services
  
  
• Fill the form completely.
  
  
• Do not file this form to report temporary address as long as you maintain your present address as your permanent residence and continue to receive mail there.
  
  
• You need to report only the most recent last address, not numerous last addresses.
  
  
• Submit a separate form for each individual applicant. Do not submit just one form for the entire family.
  
  
• Include all applicable receipt numbers to ensure that the address is changed for all Forms pending.
  
  

A willful failure to notify USCIS of a change of address (by filing AR11) within 10 days of the address change is a misdemeanor crime. If convicted, the alien (or parent or legal guardian of an alien under age 14 who is required to give notice) can be fined up to $200 or imprisoned up to 30 days, or both. The alien may also be subject to removal from the United States. Aliens must comply with the requirement of notifying USCIS for any address changes as it is a condition of an alien's stay in the United States. Failure to comply could also jeopardize the alien's ability to obtain a future visa or other immigration benefit.

If you move without notifying change of address to USCIS, USCIS mail may not be forwarded by the U.S. Pastel Service. It may be returned to USCIS mailing office as undeliverable. USCIS may destroy the mail if not claimed by the applicant within 1 year.

If you have a pending application with USCIS, and you moved since you filed your application, you must inform USCIS of your new address. Procedure is different based on where you filed your application/petition.

• Online:
  This is the easiest option. You can visit the USCIS web site and change the address there. You will receive the confirmation number at the end of the process. Keep that along with your other immigration documents as a proof.
  
  
• At service center:
  You must call USCIS customer service at 1-800-375-5283 to report change of address and get the address on the pending application/petition changed.
  
  
• Local office:
  Send a letter to USCIS field office
  
  Sample letter

Additionally, if you are non-US citizen, you must file Form AR-11, as described above.

It is best not to move (change address) while the application is pending or any take any long trips. USCIS or the consulate may send you a request for more information or schedule your interview at any time. Missing such important notification may result in long delays in getting your immigration/visa application approved.

Even if you follow all of the procedure above when you move to change your address, nothing is guaranteed. They may loose such notifications. Therefore, also have your mail forwarded by postal service or if possible, check regularly with the new people living in your previous home.