For K-1 fiance(e)s and their US citizen spouses, the immigration process is not over once the foreign fiance(e) has entered the US. After entry, K-1 regulations require that the couple must marry within 90 days and file to adjust the foreign fiance(e)'s status. During that time, the fiance(e) is in K-1 fiance status.
Once the adjustment of status application is sent to the USCIS, the foreign spouse is now considered an applicant for adjustment. In general, processing for the adjustment application takes about 9 - 12 months, depending on where the applicant lives and the USCIS office that has jurisdiction over the applicant.
During this time, it is imperative that the foreign applicant keep the USCIS updated regarding his/her residence. This is key so that the applicant can receive notices regarding fingerprinting as well as the adjustment interview that both will be reuqired to attend. Moreover, significant moves could actually affect where the application and interview will take place.
Per the USCIS website:
"All non-U.S. citizens (aliens) who are required to be registered are also required to keep the USCIS informed of their current address. This is particularly important when you have filed an application or petition for a benefit under the Immigration and Nationality Act and expect notification of a decision on that application. In addition, the USCIS may need to contact you to provide other issued documents or return original copies of evidence you submitted.
A willful failure to give written notice to the USCIS of a change of address within 10 days of moving to the new address is a misdemeanor crime. If convicted, you (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. (INA § 266(b)). Compliance with the requirement to notify the USCIS of any address changes is also a condition of your stay in the United States. Failure to comply could also jeopardize your ability to obtain a future visa or other immigration benefit."
There are 3 ways to notify the USCIS of a change of address. Perhaps the easiest is to do it online. To do so, click on this link: https://egov.uscis.gov/crisgwi/go?action=coa
Alternatively, a foreign applicant may call the USCIS at (800) 375-5283 or mail the AR-11 form in. For the latter, the address as of 3/3/11 is
DHS/USCIS
Harrisonburg File Storage Facility
Attn: AR-11
1344 Pleasants Drive
Harrisonburg, VA 22801