COUNTY · MS
Washington County, Mississippi
Washington County is a county in Mississippi with FIPS code 28151 and an estimated population of 41,946 (Census 2023), 18th largest of 82 in the state.
County facts
- Name
- Washington County
- State
- Mississippi
- Type
- county
- FIPS code
- 28151
- State FIPS
- 28
- Population (2023)
- 41,946
- Change since 2020
- -6.0%
- State rank
- 18 of 82
Population is the Census Bureau’s Vintage 2023 estimate.
Other counties in Mississippi
Questions
What is the FIPS code for Washington County?
Washington County, Mississippi has the five-digit FIPS code 28151: 28 for the state and 151 for the county.
What state is Washington County in?
Washington County is in Mississippi.
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.