| Foster Township | |
| Settlement Type: | Township |
| Pushpin Map: | Minnesota#USA |
| Pushpin Label Position: | left |
| Pushpin Map Caption: | Location within the state of Minnesota |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Minnesota |
| Subdivision Type2: | County |
| Subdivision Name2: | Big Stone |
| Unit Pref: | Imperial |
| Area Total Km2: | 86.0 |
| Area Land Km2: | 77.8 |
| Area Water Km2: | 8.1 |
| Area Total Sq Mi: | 33.2 |
| Area Land Sq Mi: | 30.1 |
| Area Water Sq Mi: | 3.1 |
| Population As Of: | 2000 |
| Population Total: | 123 |
| Population Density Km2: | 1.6 |
| Population Density Sq Mi: | 4.1 |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation M: | 336 |
| Elevation Ft: | 1102 |
| Coordinates: | 45.465°N -96.6703°W |
| Blank Name: | FIPS code |
| Blank Info: | 27-22058[1] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 0664205[2] |
Foster Township is a township in Big Stone County, Minnesota, United States. The population was estimated at 110 in the 2020 census.[3] Situated in the southwest region of the county, the township has a western boundary with South Dakota. Big Stone Lake and the Little Minnesota River drain it.
According to the United States Census Bureau, the township has a total area of 33.2sqmi, of which 30.1sqmi is land and 3.1sqmi (9.43%) is water.
(This list is based on USGS data and may include former settlements.)
The township contains two cemeteries, Holden and Lakeside.
At the 2000 census, there were 123 people, 57 households and 42 families residing in the township. The population density was 4.1 per square mile (1.6/km). There were 169 housing units at an average density of 5.6/sq mi (2.2/km). The racial makeup of the township was 98.37% White and 1.63% Asian.
There were 57 households, of which 15.8% had children under the age of 18 living with them, 70.2% were married couples living together, and 26.3% were non-families. 24.6% of all households were made up of individuals, and 7.0% had someone living alone who was 65 years of age or older. The average household size was 2.16, and the average family size was 2.50.
15.4% of the population were under the age of 18, 5.7% from 18 to 24, 15.4% from 25 to 44, 40.7% from 45 to 64, and 22.8% were 65 years of age or older. The median age was 52 years. For every 100 females, there were 141.2 males. For every 100 females age 18 and over, there were 126.1 males.
The median household income was $31,875 and the median family income was $41,250. Males had a median income of $22,500 and females $22,083. The per capita income was $16,178. There were 17.5% of families and 18.4% of the population living below the poverty line, including 19.0% of those under eighteen and none of those over 64.