Foster, Indiana | |
|---|---|
| Coordinates: 40°08′30″N 87°28′07″W / 40.14167°N 87.46861°W | |
| Country | United States |
| State | Indiana |
| County | Warren |
| Township | Mound |
| Founded | 1893 |
| Named for | William R. Foster |
| Area | |
• Total | 1.29 sq mi (3.33 km2) |
| • Land | 1.29 sq mi (3.33 km2) |
| • Water | 0 sq mi (0.00 km2) |
| Elevation | 630 ft (190 m) |
| Population (2020) | |
• Total | 104 |
| • Density | 80.9/sq mi (31.24/km2) |
| Time zone | UTC-5 (Eastern (EST)) |
| • Summer (DST) | UTC-4 (EDT) |
| ZIP code | 47993 |
| Area code | 765 |
| GNIS feature ID | 2806489 |
Foster is a small unincorporated community in Mound Township, Warren County, in the U.S. state of Indiana. As of the 2020 census, Foster had a population of 104.
Foster was platted on April 25, 1893, on land donated by William R. Foster, an early settler. At one time the town had a post office, blacksmith shop, railroad depot, two stores, a stockyard, a threshing machine, a grain elevator and a sawmill. Currently it consists of a few private residences, a couple of small shops and a motel.
A post office was established at Foster in 1883, and remained in operation until it was discontinued in 1905.

Foster is located just north of U.S. Route 136 about 5 miles (8.0 km) west of Covington and about 3 miles (4.8 km) east of the Indiana-Illinois border. The Vermilion Valley Railroad (originally the New York Central Railroad) passes through Fowler, and the north fork of Spring Creek flows along its western edge.
| Census | Pop. | Note | %± |
|---|---|---|---|
| 2020 | 104 | — | |
| U.S. Decennial Census | |||
It is in the Covington Community School Corporation.