COUNTY · SD
Yankton County, South Dakota
Yankton County is a county in South Dakota with FIPS code 46135 and an estimated population of 23,517 (Census 2023), 9th largest of 66 in the state.
County facts
- Name
- Yankton County
- State
- South Dakota
- Type
- county
- FIPS code
- 46135
- State FIPS
- 46
- Population (2023)
- 23,517
- Change since 2020
- +1.0%
- State rank
- 9 of 66
Population is the Census Bureau’s Vintage 2023 estimate.
Questions
What is the FIPS code for Yankton County?
Yankton County, South Dakota has the five-digit FIPS code 46135: 46 for the state and 135 for the county.
What state is Yankton County in?
Yankton County is in South 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.