Foster
- County:
- Stephens County
- County Seat:
- No
- Area (mi²):
- 34.461
- State:
- Oklahoma
Foster is a town located in Stephens County, Oklahoma. Foster has a 2026 population of 249. Foster is currently growing at a rate of 0.81% annually and its population has increased by 1.63% since the most recent census, which recorded a population of 245 in 2020.