The INS operates a suboffice of the Honolulu District Office in Guam. The office serves Guam and the Northern Mariana Islands. The office is located at 108 Hernan Cortez Avenue, Suite 801, Hagatna, Guam 96910. The office is open from 8:00am until 2:30pm Monday through Friday. Click here to find the INS USCIS Immigration Forms you need! Click Here for Immigration Information, Reports, and Frequent Questions Click here to find the immigration books and manuals you need!