According to the U.S. Census Bureau, the county has an area of 768 square miles (1,990km2), of which 763 square miles (1,980km2) is land and 5.4 square miles (14km2) (0.7%) is water.[8] It is drained by tributaries of the Pecatonica River,[9] which has its headwaters in the county. The highest point in the county is West Blue Mound at 1,716ft. above sea level. The lowest point is the Wisconsin river at the Grant County line at 667ft. above sea level.
Iowa County is served by Lamers Connect which offers two buses a day, one traveling east to Madison and Milwaukee and one west to Dubuque via its Dodgeville stop.
As of the 2020 census, the county had a population of 23,709, a median age of 44.5 years, 22.2% of residents were under the age of 18, and 20.1% of residents were 65 years of age or older. For every 100 females there were 101.1 males, and for every 100 females age 18 and over there were 99.2 males.[16]
The population density was 31.1 peopleper square mile (12.0 people/km2). There were 10,905 housing units at an average density of 14.3 unitsper square mile (5.5 units/km2).[1]
There were 9,901 households in the county, of which 27.7% had children under the age of 18 living in them. Of all households, 53.4% were married-couple households, 17.6% were households with a male householder and no spouse or partner present, and 20.8% were households with a female householder and no spouse or partner present. About 27.2% of all households were made up of individuals and 12.1% had someone living alone who was 65 years of age or older.[16]
There were 10,905 housing units, of which 9.2% were vacant. Among occupied housing units, 76.3% were owner-occupied and 23.7% were renter-occupied. The homeowner vacancy rate was 0.8% and the rental vacancy rate was 6.0%.[16]
20.7% of residents lived in urban areas, while 79.3% lived in rural areas.[18]
2000 census
2000 Census Age Pyramid for Iowa County.
As of the census[19] of 2000, there were 22,780 people, 8,764 households, and 6,213 families residing in the county. The population density was 30 peopleper square mile (12 people/km2). There were 9,579 housing units at an average density of 13 unitsper square mile (5.0 units/km2). The racial makeup of the county was 98.70% White, 0.17% Black or African American, 0.11% Native American, 0.34% Asian, 0.01% Pacific Islander, 0.11% from other races, and 0.55% from two or more races. 0.33% of the population were Hispanic or Latino of any race. 33.6% were of German, 17.2% Norwegian, 11.6% English, 11.3% Irish and 7.9% American ancestry.
There were 8,764 households, out of which 34.60% had children under the age of 18 living with them, 59.50% were married couples living together, 7.60% had a female householder with no husband present, and 29.10% were non-families. 24.30% of all households were made up of individuals, and 10.10% had someone living alone who was 65 years of age or older. The average household size was 2.56 and the average family size was 3.06.
In the county, the population was spread out, with 27.10% under the age of 18, 6.60% from 18 to 24, 30.40% from 25 to 44, 22.50% from 45 to 64, and 13.30% who were 65 years of age or older. The median age was 37 years. For every 100 females, there were 99.30 males. For every 100 females age 18 and over, there were 97.70 males.
Politics
United States presidential election results for Iowa County, Wisconsin[20]
Iowa County historically tilted Republican for much of the 20th century. However, it has swung heavily to the Democrats since the 1970s. It has supported the Democratic presidential candidate in all but one election since 1976, and is one of the most Democratic counties in Wisconsin. However, Donald Trump's 2024 performance of over 45% was the best by a Republican since George H. W. Bush lost the county by only 28 votes in 1988. This was also the first time since 1988 that a Republican held a Democratic winner of the county to a single-digit margin of victory.[21]
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