How Many Time Zones in USA?

How many time zones in USA? The United States has 6 time zones: 4 on the mainland plus Alaska and Hawaii. Here's the complete breakdown of all US time zones.

How Many Time Zones in USA?

The United States has 6 time zones.

The 6 US Time Zones

Zone	Standard	DST	Major Cities
Eastern	UTC-5	UTC-4	New York, Miami, Atlanta, Boston
Central	UTC-6	UTC-5	Chicago, Dallas, Houston, Minneapolis
Mountain	UTC-7	UTC-6	Denver, Phoenix, Salt Lake City
Pacific	UTC-8	UTC-7	Los Angeles, Seattle, San Francisco
Alaska	UTC-9	UTC-8	Anchorage, Fairbanks
Hawaii-Aleutian	UTC-10	No DST	Honolulu, Hilo

US Territories (Additional Zones)

Territory	UTC Offset	DST?
Puerto Rico, US Virgin Islands	UTC-4	No
Guam, Northern Mariana Islands	UTC+10	No
American Samoa	UTC-11	No
Wake Island	UTC+12	No

Population by Time Zone

Zone	Approx. Population	% of US
Eastern	~175 million	~53%
Central	~95 million	~29%
Pacific	~50 million	~15%
Mountain	~22 million	~7%
Alaska	~730,000	~0.2%
Hawaii	~1.4 million	~0.4%

The Arizona Exception

Arizona (except Navajo Nation) stays on MST (UTC-7) year-round — no DST. This means in summer, Phoenix is on the same time as Los Angeles (PDT = UTC-7), not Denver (MDT = UTC-6).

Quick Answer

The USA has 6 time zones: Eastern, Central, Mountain, Pacific, Alaska, and Hawaii-Aleutian. Including territories, the US spans 10 time zones total.

How Many Time Zones in USA?