UTC−06:00

CST is standard time in the 6th time zone west of Greenwich, centralized by the 90th meridian; used in North America in some parts of Canada, Mexico and the United States.^[1]

• Canada (Central Time Zone)
  • Manitoba
  • Nunavut
    • Kivalliq Region except Southampton Island (Coral Harbour)
  • Ontario
    • West of 90° west^[2]
• Mexico (near US border with Texas)
  • Chihuahua
    • The municipalities of Coyame del Sotol, Ojinaga and Manuel Benavides ^[3]
  • Coahuila de Zaragoza
    • The municipalities of Acuña, Allende, Guerrero, Hidalgo, Jiménez, Morelos, Nava, Ocampo, Piedras Negras, Villa Unión and Zaragoza
  • Nuevo León
    • The municipality of Anahuac
  • Tamaulipas
    • The municipalities of Nuevo Laredo, Guerrero, Mier, Miguel Alemán, Camargo, Gustavo Díaz Ordaz, Reynosa, Río Bravo, Valle Hermoso and Matamoros
• United States (Central Time Zone)
  • Alabama
    • The city of Phenix City uses both UTC−05:00 and UTC−06:00 due to its proximity to Columbus, Georgia
  • Arkansas
  • Florida
    • The counties of Bay, Calhoun, Escambia, Holmes, Jackson, Okaloosa, Santa Rosa, Walton, and Washington, and northern Gulf County (panhandle)^[4]
  • Illinois
  • Indiana ^[5]
    • Northwestern counties of Jasper, Lake, LaPorte, Newton, Porter and Starke
    • Southwestern counties of Gibson, Perry, Posey, Spencer, Vanderburgh and Warrick
  • Iowa
  • Kansas
    • Entire state except Greeley, Hamilton, Sherman and Wallace counties
  • Kentucky
    • The counties of Breckinridge, Grayson, Hart, Green, Adair, Russell and Clinton, and all counties to the west of these^{[4] [6]}
  • Louisiana
  • Michigan ^[7]
    • The western counties of Dickinson, Gogebic, Iron and Menominee
  • Minnesota
  • Mississippi
  • Missouri
  • Nebraska
    • Central and eastern Nebraska
  • North Dakota
    • Entire state except southwest
  • Oklahoma
    • Entire state except Kenton
  • South Dakota
    • Eastern half
  • Tennessee
    • Counties to the west of the counties of Scott, Morgan, Roane, Rhea, and Hamilton ^{[4] [8]}
  • Texas
    • All except northwestern Culberson, El Paso and Hudspeth counties
  • Wisconsin

• Canada (Mountain Time Zone)^[9]
  • British Columbia ^[10]
    • The south-eastern communities of Cranbrook, Golden, Invermere and Kimberley
  • Northwest Territories
  • Nunavut
    • Kitikmeot Region ^[11]
• Mexico (near US border with New Mexico & western Texas)
  • Chihuahua
    • The municipalities of Janos, Ascensión, Juárez, Práxedis G. Guerrero and Guadalupe ^[3]
• United States (Mountain Time Zone)^[4]
  • Arizona - Navajo Nation only
  • Colorado
  • Idaho ^[12]
    • South of Salmon River
  • Kansas
    • The western counties of Greeley, Hamilton, Sherman and Wallace
  • Montana
  • Nebraska
    • The western counties of Cherry (western part), Hooker, Arthur, Keith, Perkins, Chase and Dundy, and all counties to the west of these
  • Nevada
    • West Wendover
  • New Mexico
  • North Dakota
    • The Southwestern counties of Adams, Billings, Bowman, Dunn (southern part), Golden Valley, Grant, Hettinger, McKenzie (southern part), Sioux (west of ND route 31), Slope and Stark
  • Oklahoma
    • Kenton
  • Oregon
    • Malheur County (except a small strip in the south)
  • South Dakota
    • The western counties of Corson, Dewey, Stanley (western part), Jackson and Bennett, and all counties to the west of these
  • Texas
    • The western counties of Culberson (northwestern part), El Paso and Hudspeth
  • Utah
  • Wyoming

• Belize
• Costa Rica
• El Salvador
• Guatemala
• Honduras
• Nicaragua
  • Called Central America Time Zone

• Canada (Central Time Zone)
  • Alberta, where it is officially called Alberta Time and formerly known as Mountain Daylight Time.^[13]
  • Saskatchewan
• Mexico (Zona Centro)
  • All except Baja California, Baja California Sur, most of Nayarit, Quintana Roo, Sinaloa, Sonora and the northern municipalities of Chihuahua, Coahuila, Nuevo León and Tamaulipas.^[3]
  • A small enclave of the UTC−6 time zone is followed in the municipality of Bahía de Banderas, Nayarit, due to its strong economic ties with the neighboring municipality of Puerto Vallarta, Jalisco. In most UNIX-like operating systems this area is represented as America/Bahia_Banderas.