Jefferson County, Wisconsin

Jefferson County, Wisconsin, has 14 towns and 10 ZIP codes, in area code 920, with 274 as an overlay.

Towns in Jefferson County, A to Z

Town	ZIP codes	Area codes
Fort Atkinson	53538	920, 274
Hebron	nearest53156	920, 274
Helenville	53137	920, 274
Ixonia	53036	920, 274
Jefferson	53549	920, 274
Johnson Creek	53038	920, 274
Lac La Belle	nearest53003, 53036, 53066	920, 274, 262
Lake Koshkonong	nearest53538	920, 274
Lake Mills	53551	920, 274
Palmyra	53156	920, 274
Rome	nearest53137, 53178	920, 274
Sullivan	53178	920, 274
Waterloo	53594	920, 274
Watertown	53094, 53098	920, 274

ZIP codes in Jefferson County

53036Ixonia920, 274
53038Johnson Creek920, 274
53094Watertown920, 274
53137Helenville920, 274
53156Palmyra920, 274
53178Sullivan920, 274
53538Fort Atkinson920, 274
53549Jefferson920, 274
53551Lake Mills920, 274
53594Waterloo920, 274

Area codes in Jefferson County

Area code 920
In service since July 26, 1997. Shares its area with 274. Local calls are dialed with ten digits; dialing 1 plus ten digits also works.
Area code 274
In service since May 5, 2023. Shares its area with 920. Local calls are dialed with ten digits; dialing 1 plus ten digits also works.

Local numbers in area code 920

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