Administrative divisions: 50 states and 1 district (Colombia).
Dependent areas: American Samoa, Baker Island, Guam, Howland Island, Jarvis Island, Johnston Atoll, Kingman Reef, Midway Islands, Navassa Island, Northern Mariana Islands, Palmyra Atoll, Puerto Rico, Virgin Islands, Wake Island.
note: from 18 July 1947 until 1 October 1994, the US administered the Trust Territory of the Pacific Islands, but recently entered into a new political relationship with all four political units: the Northern Mariana Islands is a commonwealth in political union with the US (effective 3 November 1986); Palau concluded a Compact of Free Association with the US (effective 1 October 1994); the Federated States of Micronesia signed a Compact of Free Association with the US (effective 3 November 1986); the Republic of the Marshall Islands signed a Compact of Free Association with the US (effective 21 October 1986).
A geographic area consisting of several States defined by the U.S. Department of Commerce, Bureau of the Census. The States are grouped into four regions and nine divisions: