2. The United States
Number of Time Zones: 11
Although by law, there are 9 time zones in the United States, which ranks second on our list of countries that have the most time zones. In reality, there are two more. These time zones are used in the United States Minor Outlying Islands and Antarctic research stations. Out of the 9 that are defined by law, 4 belong to the mainland. UTC−05:00 or Eastern Time Zone (ET) completely covers 17 states and is used in the Atlantic Ocean coast region. UTC−6:00 or North American Central Time Zone (CT) is used in the central part of the country and covers 21 states (in full or partially). UTC−7:00 or Mountain Time Zone covers 14 states (in full or partially). Lastly, UTC−8:00 or Pacific Time Zone covers the region of Pacific Ocean coast including California, Washington, Nevada, almost all of Oregon and north half of Idaho. All of these parts of the United States use daylight saving time. Alaska uses UTC−09:00 time zone while Hawaii is covered by UTC−10:00. The time zones UTC−04:00, UTC−11:00, UTC+10:00 are used by Puerto Rico, American Samoa, and Guam respectively.
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