County · code 46135
Yankton CountySouth Dakota
Yankton County is a county in South Dakota with its seat in the city of Yankton. It was created in 1862 as part of Dakota Territory and became a county of South Dakota in 1889.
- Founded1862
- County seatYankton
- Named forYankton
- Land area521 sq mi + 11 sq mi water
- Population23,310 2020 Census
- Parcels mapped15,980 checked 15 October 2026
Where it is
Yankton on the map of South Dakota
South Dakota has 66 counties and county equivalents, each with its own records office. Shapes with a page are links.
History
Founded in 1862
An old deed may name a county that no longer exists, or a boundary that has since moved.
Yankton County was created by Dakota Territory on April 10, 1862, from non-county area. When South Dakota became a state in 1889, Yankton became one of its counties.
- 1862Yankton County created Yankton created by Dakota Territory in present South Dakota from non-county area. · Dak. Terr. Laws 1862, 1st sess., ch. 19/p. 250
- 1889Became part of South Dakota Yankton became a county in the state of South Dakota. · U.S. Stat., vol. 25, ch. 180[1889]/pp. 676-684; U.S. Stat., vol. 26, no. 5/pp. 1548-1549; Swindler, 9:107-109; Van Zandt, 134
Land and parcels
What the maps cover in Yankton
Who publishes each layer, how good it is, and when we last checked.
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Parcels Good enough
Lot lines and tax-map numbers for 15,980 parcels from Yankton County. Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
checked 15 October 2026 -
Address points Missing
No public address points layer found for Yankton County yet.
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Buildings Reference
Roof outlines traced from aerial imagery from FEMA Response Geospatial Office with Oak Ridge National Laboratory (ORNL). Good for seeing what is on a lot; not accurate enough to set a fence from.
checked 18 October 2026
- Official
- from the office that keeps the record
- Good enough
- a reliable statewide or national copy
- Fallback
- a guide only; check the official record
- Missing
- nothing public found yet
People and land
Yankton by the Census
Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.
Rules and offices
Who to ask before you build, dig or sell
Official county pages only. We link to them; we do not copy them, because they change.
Inside a city or town, permits usually come from that city rather than the county.
Zoning and code
County government
- County government
The official website of Yankton County.
See your own lot on these maps
Open Yankton County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.
Questions
Common questions about Yankton County
- When was Yankton County founded?
- Yankton County was founded in 1862, and named after Yankton.
- What is the county seat of Yankton County?
- The county seat of Yankton County is Yankton.
- Is there an online parcel map for Yankton County?
- Yes. Yankton County publishes a parcel map of 15,980 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has Yankton County's boundary or name changed?
- Yankton County was created in 1862. Since then the Atlas of Historical County Boundaries records 1 later change.
- Who issues building permits in Yankton County?
- The county's page on building permits: Building Permits/Signs Application. Inside a city or town, ask that city first.
- Is my lot in a flood zone?
- We do not have flood maps for Yankton County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby