Central Time Zone

Canada

The Canadian province that observes Central Time in its entirety:

Manitoba

The Canadian provinces and territories that observe Central Time in part with another time zone (other time zone):

Nunavut (Eastern) most of Kivalliq Region and part of Qikiqtaaluk Region
Ontario (Eastern) northwestern part
Most of Saskatchewan does not observe daylight savings time, making its time offset identical to Mountain Daylight Time when DST is in effect. Major exceptions include Lloydminster, a town situated on the border between Alberta and Saskatchewan; the town charter indicates that it is a part of the Mountain Time Zone and observes DST along with Alberta.

United States

The states of the United States that observe Central Time in their entirety:

Alabama
- Although the entire state of Alabama is legally on Central Time, Phenix City and a number of surrounding communities unofficially observe Eastern Time, as Phenix City is part of the media market and metropolitan area of the considerably larger city of Columbus, Georgia (which is in the Eastern Time Zone).^{[citation needed]}
Arkansas
Illinois
Iowa
Louisiana
Minnesota
Mississippi
Missouri
Oklahoma
- Although the entire state of Oklahoma is legally on Central Time, the unincorporated community of Kenton, at the extreme western end of the Oklahoma Panhandle, unofficially observes Mountain Time (as the nearest sizeable towns are located in nearby Colorado and New Mexico, both of which are in the Mountain Time Zone).^{[citation needed]}
Wisconsin

The states of the United States that observe Central Time only in part with another time zone:

Part in Mountain Time

Kansas: Entire state except for Sherman, Wallace, Greeley and Hamilton, all of which border Colorado
Nebraska: Eastern two-thirds
North Dakota: Entire state except for southwestern quadrant
South Dakota: Eastern half
Texas: Entire state in Central Time Zone except for Hudspeth and El Paso counties and a portion of Culberson County

Part in Eastern Time

Florida: Panhandle west of Apalachicola River
Indiana: Southwestern and northwestern corners (see Time in Indiana)
Kentucky: Western half
Michigan: Far western Upper Peninsula
Tennessee: Western two-thirds

The exact specification for the location of time zones and the dividing line between zones is set forth in the Code of Federal Regulations at 49 CFR 71.^[1]

Mexico

Most of Mexico belongs to the Central Time Zone, with the six northwestern-most states being the exception: Baja California Sur, Chihuahua, Nayarit, Sinaloa, and Sonora follow UTC−7, while Baja California follows UTC−8.

The states of Mexico that observe Central Time in their entirety:

Mexico City, which is not a state but instead forms a separate federal district (Distrito Federal), also observes Central Time.

The states of Mexico that observe Central Time only in part with another time zone (other time zone).

Nayarit just the Bahia de Banderas municipality uses the Central time zone.

Central Daylight Time

Daylight saving time is in effect in much of the time zone between mid-March and early November. The modified time is called Central Daylight Time (CDT) and is UTC−5. Saskatchewan, Sonora and Galápagos do not observe the change, remaining on Standard Time year round. One reason that Saskatchewan does not take part in the time change is that geographically, most of the province should be placed in the Mountain Time Zone. To avoid this, they have moved onto "permanent" daylight saving by being part of the Central Time Zone. The only exception is the region immediately surrounding the Saskatchewan side of the biprovincial city of Lloydminster, which has chosen to use Mountain Time with DST, synchronizing its clocks with those of Alberta.

In some areas, starting in 2007, the local time changes from CST to CDT at 02:00 LST to 03:00 LDT on the second Sunday in March and returns at 02:00 LDT to 01:00 LST on the first Sunday in November. Mexico decided not to go along with this change and observes DST from the first Sunday in April to the last Sunday in October.

Alphabetical list of cities and metropolitan areas

Information courtesy of http://wikipedia.org/