(800) 375-5283Immigration-related petitions and applications submitted by claimants are processed by the USCIS Potomac Service Center, operating under the auspices of the United States Citizenship & Immigration Services agency. Applicants have the option to place calls to inquire about the processing timelines for their applications prior to submission or to ascertain the status of their cases. The processing durations are subject to variation based on the nature of the application and additional factors.