According to the United States Census Bureau, the town has a total area of 59.4 square miles, of which, 33.5 square miles of it is land and 25.9 square miles of it is water.
Demographics
As of the census of 2000, there were 5,756 people, 1,998 households, and 1,646 families residing in the town. The population density was 171.7 people per square mile. There were 2,139 housing units at an average density of 63.8 per square mile. The racial makeup of the town was 98.35% White, 0.40% African American, 0.12% Native American, 0.69% Asian, 0.16% from other races, and 0.28% from two or more races. Hispanic or Latino of any race were 0.59% of the population. There were 1,998 households, out of which 44.2% had children under the age of 18 living with them, 76.2% were married couplesliving together, 3.8% had a female householder with no husband present, and 17.6% were non-families. 13.9% of all households were made up of individuals, and 3.4% had someone living alone who was 65 years of age or older. The average household size was 2.88 and the average family size was 3.20. In the town, the population was spread out, with 31.0% under the age of 18, 4.9% from 18 to 24, 35.8% from 25 to 44, 20.7% from 45 to 64, and 7.6% who were 65 years of age or older. The median age was 35 years. For every 100 females, there were 102.7 males. For every 100 females age 18 and over, there were 102.8 males. The median income for a household in the town was $66,094, and the median income for a family was $69,729. Males had a median income of $46,268 versus $31,060 for females. The per capita income for the town was $24,690. About 1.4% of families and 1.4% of the population were below the poverty line, including 1.8% of those under age 18 and none of those age 65 or over.
Intent to incorporate
On September 9, 2011 the Town Board of Harrison filled a notice of intent to incorporate as a village. The plan would call for the more densely populated northwestern corner of the town to incorporate into a village of approximately 7,400 residents. On February 19, 2013, there was a referendum approving the incorporation of part of the town as a village. The Wisconsin Secretary of State authorized the new village's incorporation on March 8, 2013. All remaining parts that were still the town of Harrison have been incorporated into the Village of Harrison.
Notable people
Benjamin F. Carter, Wisconsin State Representative and Senator, farmer and bricklayer, lived in the town.
August T. Dorn, Wisconsin State Representative and farmer, lived in the town.
Henry W. Hupfauf, Wisconsin State Representative, farmer, and businessman, was born in the town.
George J. Schwalbach, Wisconsin State Representative and farmer, was born in the town.
