UTC+10:00 Chamorro Time Zone comprises Guam and the Northern Mariana Islands, located in the northwestern part of the Pacific Ocean.UTC-11:00 Samoa Time Zone embraces the American Samoa islands in the South Pacific.UTC-04:00 Atlantic Time Zone comprises the Puerto Rico and the United States Virgin Islands in the Caribbean.

Other 3 time zones are used in the insular areas of the US, outside of the states. UTC-10:00 Hawaii-Aleutian Time Zone covers Hawaii and western part of the Aleutian Islands belonging to Alaska.UTC-09:00 Alaska Time Zone, as clearly observed in its name, includes the most of the territory of Alaska.UTC-08:00 Pacific Time Zone covers 6 states - the entire states of California and Washington, most of Nevada and Oregon with some exceptions, the Metlakatla Indian Community in Alaska, and some northern parts of Idaho.UTC-07:00 Mountain Time Zone includes 14 states, only 6 of them are wholly in this zone, all the others use the Mountain Time in some parts of their territories.UTC-06:00 Central Time Zone, the largest one by area, encompasses 20 states, but only 10 of them are located entirely within zone's boundaries, all remaining states have some exceptions.De facto the Eastern Time often is used as the USA official time. UTC-05:00 Eastern Time Zone, the most populous in the USA, includes the District of Columbia with the capital city of Washington and 23 states wholly or partially located within this zone.The entire 50 states and the District of Columbia have 6 main time zones. There are 9 standard time zones in the US officially defined by federal law.

Wisconsin time zone