COUNTY · ND
Foster County, North Dakota
Foster County is a county in North Dakota with FIPS code 38031 and an estimated population of 3,309 (Census 2023), 32nd largest of 53 in the state.
County facts
- Name
- Foster County
- State
- North Dakota
- Type
- county
- FIPS code
- 38031
- State FIPS
- 38
- Population (2023)
- 3,309
- Change since 2020
- -2.3%
- State rank
- 32 of 53
Population is the Census Bureau’s Vintage 2023 estimate.
Other counties in North Dakota
Questions
What is the FIPS code for Foster County?
Foster County, North Dakota has the five-digit FIPS code 38031: 38 for the state and 031 for the county.
What state is Foster County in?
Foster County is in North Dakota.
How do I know if an address is in this county?
Use the address lookup. ZIP codes and city names can cross county lines, so an address is the reliable check.
Sources: U.S. Census Bureau geographic reference files; Census Bureau Population Estimates, Vintage 2023. Last reviewed 2026-10-27.