text: Well, this is a tough one... There's a couple agencies that track different aspects to citizenship; there isn't a US Citizenship office per se. \n\nThe State Department manages the "Department of State’s Bureau of Consular Affairs" which issues and manages US passports.\n\nThe Census Bureau, a division of the U.S. Department of Commerce.\n\nWithout a "domestic passport" issued to all US citizens (similar to the old Russian domestic passport) there isn't an accurate way to track this.