| Official Name: | Williamstown, Wisconsin |
| Settlement Type: | Town |
| Mapsize: | 250px |
| Subdivision Type: | Country |
| Subdivision Name: |  United States |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Dodge |
| Unit Pref: | Imperial |
| Area Total Km2: | 86.9 |
| Area Land Km2: | 85.2 |
| Area Water Km2: | 1.7 |
| Area Total Sq Mi: | 33.6 |
| Area Land Sq Mi: | 32.9 |
| Area Water Sq Mi: | 0.7 |
| Population As Of: | 2000 |
| Population Total: | 646 |
| Population Density Km2: | 7.6 |
| Population Density Sq Mi: | 19.6 |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Footnotes: | [1] |
| Elevation M: | 266 |
| Elevation Ft: | 873 |
| Coordinates: | 43.5006°N -88.5694°W |
| Blank Name: | FIPS code |
| Blank Info: | 55-87225[2] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 1584440 |
| Website: | http://williamstown-wi.com/ |
Williamstown is a town in Dodge County, Wisconsin, United States. The population was 646 at the 2000 census.
According to the United States Census Bureau, the town has a total area of 33.6 square miles (86.9 km), of which, 32.9 square miles (85.2 km) of it is land and 0.7 square miles (1.8 km) of it (2.03%) is water.
At the 2000 census there were 646 people, 235 households, and 195 families living in the town. The population density was 19.6 people per square mile (7.6/km). There were 242 housing units at an average density of 7.4 per square mile (2.8/km). The racial makeup of the town was 98.61% White, 0.15% African American, 0.15% Native American, 0.31% Asian, 0.15% from other races, and 0.62% from two or more races. Hispanic or Latino of any race were 1.08%.
Of the 235 households 32.3% had children under the age of 18 living with them, 74.5% were married couples living together, 3.8% had a female householder with no husband present, and 17.0% were non-families. 13.6% of households were one person and 4.7% were one person aged 65 or older. The average household size was 2.75 and the average family size was 3.03.
The age distribution was 23.5% under the age of 18, 7.6% from 18 to 24, 28.6% from 25 to 44, 28.6% from 45 to 64, and 11.6% 65 or older. The median age was 40 years. For every 100 females, there were 107.1 males. For every 100 females age 18 and over, there were 112.9 males.
The median household income was $62,969 and the median family income was $69,688. Males had a median income of $41,313 versus $26,875 for females. The per capita income for the town was $25,167. About 2.1% of families and 1.9% of the population were below the poverty line, including none of those under age 18 and 2.6% of those age 65 or over.