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Welcome to Jefferson County ...

Time Zone: Jefferson County lies in the Central Time Zone (CST/CDT) and observes daylight saving time.

The community of Jefferson is the Seat for Jefferson County.

Jefferson County was founded in 1836 and was created by taking area from Milwaukee County.

From the Census Estimates for 2019, <1> Jefferson had a population of 84,769 people. This is an increase of 1.25% since the last Census (which gave a population of 83,724 people in 2010).

At the time of the 2010 Census, Jefferson represented 1.47% of the total population of Wisconsin.

Below are some of the communities located in Jefferson County:

  • Aztalan
    (2 miles [3.2 km] to the west)
    • Aztalan is located in Jefferson County (WI)
    • Jump to our Gazetteer entry for Aztalan
    • Population from the 2020 Census: 1,493 people
  • Cold Spring
    (11 miles [17.7 km] to the south)
    • Cold Spring is located in Jefferson County (WI)
    • Jump to our Gazetteer entry for Cold Spring
    • Population from the 2020 Census: 754 people
  • Concord
    (9 miles [14.5 km] to the east)
    • Concord is located in Jefferson County (WI)
    • Jump to our Gazetteer entry for Concord
    • Population from the 2020 Census: 2,130 people
  • Farmington
    (3 miles [4.8 km] to the east)
    • Farmington is located in Jefferson County (WI)
    • Jump to our Gazetteer entry for Farmington
    • Population from the 2020 Census: 1,465 people
  • Fort Atkinson
    (8 miles [12.9 km] to the south)
    • Fort Atkinson is located in Jefferson County (WI)
    • Jump to our Gazetteer entry for Fort Atkinson
    • Population from the 2020 Census: 12,372 people
  • Hebron
    (8 miles [12.9 km] to the southeast)
    • Hebron is located in Jefferson County (WI)
    • Jump to our Gazetteer entry for Hebron
    • Population from the 2020 Census: 1,132 people
  • Ixonia
    (11 miles [17.7 km] to the northeast)
    • Ixonia is located in Jefferson County (WI)
    • Jump to our Gazetteer entry for Ixonia
    • Population from the 2020 Census: 4,562 people
  • Jefferson
    (3 miles [4.8 km] to the south)
    • Jefferson is located in Jefferson County (WI)
    • Jump to our Gazetteer entry for Jefferson
    • Population from the 2020 Census: 2,251 people
  • Continue List   (17 more) ...
    • Johnson Creek
      (2 miles [3.2 km] to the north)
      • Johnson Creek is located in Jefferson County (WI)
      • Jump to our Gazetteer entry for Johnson Creek
      • Population from the 2020 Census: 3,065 people
    • Koshkonong
      (11 miles [17.7 km] to the south)
      • Koshkonong is located in Jefferson County (WI)
      • Jump to our Gazetteer entry for Koshkonong
      • Population from the 2020 Census: 3,782 people
    • Lac La Belle
      (14 miles [22.5 km] to the northeast)
      • Lac La Belle is located in Jefferson County (WI)
      • Jump to our Gazetteer entry for Lac La Belle
      • Population from the 2020 Census: 302 people
    • Lake Mills
      (9 miles [14.5 km] to the west)
      • Lake Mills is located in Jefferson County (WI)
      • Jump to our Gazetteer entry for Lake Mills
      • Population from the 2020 Census: 2,135 people
    • Milford
      (7 miles [11.3 km] to the north)
      • Milford is located in Jefferson County (WI)
      • Jump to our Gazetteer entry for Milford
      • Population from the 2020 Census: 1,135 people
    • Oakland
      (10 miles [16.1 km] to the southwest)
      • Oakland is located in Jefferson County (WI)
      • Jump to our Gazetteer entry for Oakland
      • Population from the 2020 Census: 3,215 people
    • Palmyra
      (14 miles [22.5 km] to the southeast)
      • Palmyra is located in Jefferson County (WI)
      • Jump to our Gazetteer entry for Palmyra
      • Population from the 2020 Census: 1,219 people
    • Sullivan
      (10 miles [16.1 km] to the east)
      • Sullivan is located in Jefferson County (WI)
      • Jump to our Gazetteer entry for Sullivan
      • Population from the 2020 Census: 666 people
    • Sumner
      (13 miles [20.9 km] to the southwest)
      • Sumner is located in Jefferson County (WI)
      • Jump to our Gazetteer entry for Sumner
      • Population from the 2020 Census: 857 people
    • Waterloo
      (10 miles [16.1 km] to the northwest)
      • Waterloo is located in Jefferson County (WI)
      • Jump to our Gazetteer entry for Waterloo
      • Population from the 2020 Census: 940 people
    • Watertown
      (7 miles [11.3 km] to the north)
      • Watertown is located in Jefferson County (WI)
      • Jump to our Gazetteer entry for Watertown
      • Population from the 2020 Census: 2,039 people

Websites of Interest ...

Footnotes ...

<1>On a yearly basis, the US Census Bureau creates an estimate of the county's population. Keep in mind that this is an estimate and not an actual count. The last physical count was the 2010 Census and the next count will be for the 2020 Census.