|— Town —|
Location of Gardner, Wisconsin
|- Total||113.5 sq mi (294.0 km2)|
|- Land||34.3 sq mi (88.8 km2)|
|- Water||79.2 sq mi (205.2 km2)|
|Elevation ||604 ft (184 m)|
|- Density||34.9/sq mi (13.5/km2)|
|Time zone||Central (CST) (UTC-6)|
|- Summer (DST)||CDT (UTC-5)|
|GNIS feature ID||1583256|
According to the United States Census Bureau, the town has a total area of 113.5 square miles (294.0 km²), of which, 34.3 square miles (88.8 km²) of it is land and 79.2 square miles (205.2 km²) of it (69.80%) is water.
As of the census of 2000, there were 1,197 people, 493 households, and 352 families residing in the town. The population density was 34.9 people per square mile (13.5/km²). There were 966 housing units at an average density of 28.2/sq mi (10.9/km²). The racial makeup of the town was 97.58% White, 0.25% African American, 1.42% Native American, 0.17% Asian, and 0.58% from two or more races. Hispanic or Latino of any race were 0.84% of the population.
There were 493 households out of which 28.4% had children under the age of 18 living with them, 62.5% were married couples living together, 4.9% had a female householder with no husband present, and 28.6% were non-families. 22.5% of all households were made up of individuals and 9.3% had someone living alone who was 65 years of age or older. The average household size was 2.43 and the average family size was 2.85.
In the town the population was spread out with 21.8% under the age of 18, 5.6% from 18 to 24, 28.8% from 25 to 44, 29.3% from 45 to 64, and 14.5% who were 65 years of age or older. The median age was 42 years. For every 100 females there were 108.2 males. For every 100 females age 18 and over, there were 111.8 males.
The median income for a household in the town was $39,063, and the median income for a family was $46,071. Males had a median income of $30,833 versus $21,741 for females. The per capita income for the town was $21,181. About 4.9% of families and 6.4% of the population were below the poverty line, including 8.4% of those under age 18 and 6.2% of those age 65 or over.