Grafton is a town in Ozaukee County, Wisconsin, United States. The population was 4,132 at the 2000 census. The Town of Grafton is located about 20 miles north of downtown Milwaukee on the shore of Lake Michigan. It is east of the village of Grafton and the Town of Cedarburg, south of the Town of Port Washington, and north of the city of Mequon. The unincorporated communities of Lakefield, and Ulao are located in the town.
Historically, one of the more important settlements was the community of Ulao, Wisconsin. It was located at the eastern end of the road which became State Highway 60.
The Town of Grafton was the site of Camp Hindenburg, owned and operated by the pro-Nazi German American Bund from the late 1930s through the outbreak of World War Two. In 1940, Camp Carl Schurz, operated by the anti-Bund Wisconsin Federation of German-American Societies, was opened a mile away.
According to the United States Census Bureau, the town has a total area of 21.4 square miles (55.5 km²), of which, 19.8 square miles (51.3 km²) of it is land and 1.6 square miles (4.1 km²) of it (7.47%) is water.
The Kevich Light is located in the town.
As of the census of 2000, there were 4,132 people, 1,569 households, and 1,241 families residing in the town. The population density was 208.5 people per square mile (80.5/km²). There were 1,608 housing units at an average density of 81.1 per square mile (31.3/km²). The racial makeup of the town was 98.02% White, 0.34% Black or African American, 0.22% Native American, 0.48% Asian, 0.10% Pacific Islander, 0.34% from other races, and 0.51% from two or more races. 1.11% of the population were Hispanic or Latino of any race.
There were 1,569 households out of which 33.5% had children under the age of 18 living with them, 71.5% were married couples living together, 5.0% had a female householder with no husband present, and 20.9% were non-families. 16.1% of all households were made up of individuals and 4.8% had someone living alone who was 65 years of age or older. The average household size was 2.63 and the average family size was 2.98.
In the town, the population was spread out with 24.7% under the age of 18, 5.9% from 18 to 24, 28.0% from 25 to 44, 31.2% from 45 to 64, and 10.2% who were 65 years of age or older. The median age was 41 years. For every 100 females there were 104.6 males. For every 100 females age 18 and over, there were 101.2 males.
The median income for a household in the town was $64,707, and the median income for a family was $73,125. Males had a median income of $42,320 versus $35,446 for females. The per capita income for the town was $30,582. About 4.0% of families and 5.1% of the population were below the poverty line, including 6.4% of those under age 18 and 8.0% of those age 65 or over.