Immigrants living in the U.S. and territories submit their immigration applications to the U.S. Citizenship and Immigration Services (USCIS). The federal agency interviews applicants at field offices located near those applicants. Depending on your location, the office may be in your State or neighboring State.
Regardless of the location, certain policies apply. For instance, you cannot visit without scheduling that visit with the agency. The USCIS Contact Center schedules and reschedules appointments. Note that the timings of the office may be different on your appointment day if something unusual, like bad weather, happens.
There are also some restrictions in place for visitors, including no photographs or recordings, except for citizenship ceremonies; phone on silent in the waiting area and switched off during a meeting; no firearms and ammo and other weapons such as knives and pepper spray.