Major highways

Railroads

• Amtrak
• Canadian National
• Canadian Pacific
• Union Pacific

Buses

• List of intercity bus stops in Wisconsin

Airports

• Necedah Airport (KDAF), serves the county and surrounding communities.
• Mauston–New Lisbon Union Airport (82C) enhances county service.

Adjacent counties

• Wood County - north
• Adams County - east
• Columbia County - southeast
• Sauk County - south
• Vernon County - southwest
• Monroe County - west
• Jackson County - northwest

National protected area

• Necedah National Wildlife Refuge

United States Military Posts

• Volk Field Air National Guard Base

Fort McCoy outside of Juneau county

2020 census

As of the census of 2020,^[1] the population was 26,718. The population density was 34.8 people per square mile (13.4 people/km²). There were 14,441 housing units at an average density of 18.8 units per square mile (7.3 units/km²). The racial makeup of the county was 90.9% White, 2.1% Black or African American, 1.4% Native American, 0.6% Asian, 0.9% from other races, and 4.1% from two or more races. Ethnically, the population was 2.7% Hispanic or Latino of any race.

2000 census

As of the census^[14] of 2000, there were 24,316 people, 9,696 households, and 6,699 families residing in the county. The population density was 32 people per square mile (12 people/km²). There were 12,370 housing units at an average density of 16 units per square mile (6.2 units/km²). The racial makeup of the county was 96.61% White, 0.33% Black or African American, 1.30% Native American, 0.44% Asian, 0.02% Pacific Islander, 0.57% from other races, and 0.74% from two or more races. 1.43% of the population were Hispanic or Latino of any race. 41.2% were of German, 9.9% Irish, 8.8% Norwegian, 6.5% Polish and 5.8% English ancestry.

There were 9,696 households, out of which 30.4% had children under the age of 18 living with them, 55.5% were married couples living together, 8.8% had a female householder with no husband present, and 30.9% were non-families. 26.0% of all households were made up of individuals, and 12.30% had someone living alone who was 65 years of age or older. The average household size was 2.47 and the average family size was 2.96.

In the county, the population was spread out, with 25.4% under the age of 18, 6.9% from 18 to 24, 26.6% from 25 to 44, 24.3% from 45 to 64, and 16.8% who were 65 years of age or older. The median age was 39 years. For every 100 females there were 100.1 males. For every 100 females age 18 and over, there were 97.4 males.

In 2017, there were 282 births, giving a general fertility rate of 72.7 births per 1000 women aged 15–44, the 12th highest rate out of all 72 Wisconsin counties. Of these, only 2 of the births occurred at home.^[15] Additionally, there were 16 reported induced abortions performed on women of Juneau County residence in 2017, a figure higher than the records for the preceding four years.^[16]

Cities

• Elroy
• Mauston (county seat)
• New Lisbon
• Wisconsin Dells (mostly in Columbia County, Adams County, and Sauk County)

Villages

• Camp Douglas
• Hustler
• Lyndon Station
• Necedah
• Union Center
• Wonewoc

Towns

Unincorporated communities