Regions using (North American) Central Time
The province of Manitoba is the only province or territory in Canada that observes Central Time in all areas, although if bill 205 of the Manitoba Legislative Assembly passes, Daylight Saving Time will be abolished. 
The following Canadian provinces and territories observe Central Time in the areas noted, while their other areas observe Eastern Time:
Also, most of the province of Saskatchewan is on Central Standard Time year-round, never adjusting for Daylight Saving Time. Major exceptions include Lloydminster, a city situated on the boundary between Alberta and Saskatchewan. The city charter stipulates that it shall observe Mountain Time and DST, putting the community on the same time as all of Alberta, including the major cities of Calgary and Edmonton. As a result, during the summer, clocks in the entire province match those in Alberta, but during the winter, clocks in most of the province match those in Manitoba.
Nine states are contained entirely in the Central Time Zone:
Note: Although all of Alabama is legally on Central Time, Phenix City and the nearby community of Smiths Station unofficially observe Eastern Time, as these areas are part of the metropolitan area of the considerably larger city of Columbus, Georgia in the Eastern Time Zone. Lanett and Valley observe Eastern Time historically because they were textile mill towns and the original home office of their mills was in West Point, Georgia.
Six states are split between the Central Time Zone and the Mountain Time Zone:
Five states are split between the Central Time Zone and the Eastern Time Zone:
Most of Mexico—roughly the eastern three-fourths—lies in the Central Time Zone, except for six northwestern states (Baja California, Baja California Sur, Chihuahua, Sinaloa, Sonora, and *most of Nayarit) and one southeastern state (Quintana Roo).
The federal entities of Mexico that observe Central Time:
Belize, Costa Rica, El Salvador, Guatemala, Honduras, and Nicaragua all use Central Standard Time year-round.
Eastern Pacific islands and other areas
The Galápagos Islands in Ecuador uses Central Standard Time all year-round; the remainder of Ecuador uses Eastern Standard Time. Both Easter Island and Salas y Gómez Island in Chile uses Central Standard Time during the Southern Hemisphere winter and Central Daylight Time during the Southern Hemisphere summer; the remainder of Chile uses Atlantic Standard Time and Atlantic Daylight Time.