COUNTY · AR
Washington County, Arkansas
Washington County is a county in Arkansas with FIPS code 05143 and an estimated population of 261,549 (Census 2023), 3rd largest of 75 in the state.
County facts
- Name
- Washington County
- State
- Arkansas
- Type
- county
- FIPS code
- 05143
- State FIPS
- 05
- Population (2023)
- 261,549
- Change since 2020
- +6.0%
- State rank
- 3 of 75
Population is the Census Bureau’s Vintage 2023 estimate.
Questions
What is the FIPS code for Washington County?
Washington County, Arkansas has the five-digit FIPS code 05143: 05 for the state and 143 for the county.
What state is Washington County in?
Washington County is in Arkansas.
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.