Citizenship and Immigration Services is located at JFK Federal Building Government Center, Rm E-160 Boston, MA 02203. Citizenship and Immigration Services can be reached by their main phone number at +1 (800) 375-5283. Alternatively, you can reach Citizenship and Immigration Services by phone at +1 (877) 247-4645. You can also reach Citizenship and Immigration Services by phone at +1 (877) 247-4645.