County · code 46031
Corson CountySouth Dakota
Corson County is a county in South Dakota, with its seat at McIntosh. It was created on March 2, 1909, and named after Dighton Corson.
- Founded1909
- County seatMcIntosh
- Named forDighton Corson
- Land area2,470 sq mi + 60 sq mi water
- Population3,902 2020 Census
Where it is
Corson 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
Formed in 1909 from Dewey County, Schnasse County, Boreman County and Walworth County
An old deed may name a county that no longer exists, or a boundary that has since moved.
Corson County was created from Dewey, Schnasse, Boreman, and Walworth counties, with Boreman fully absorbed into the new county. When first created, it was attached to Walworth County for judicial purposes, but was fully organized and detached from Walworth just four months later on July 13, 1909.
- 1909Corson County created Corson created from Dewey, Schnasse (extinct), all of Boreman (extinct), and part of Non-County Area 1; Boreman eliminated. Corson not fully organized, attached to Walworth “for judicial purposes.” · S. Dak. Laws 1909, 11th sess., ch. 133/p. 209
- 1909Changed Corson fully organized, detached from Walworth. · Corson Co. Commissioner's Meeting Minutes, 3 August 1909; Tidball, 68
Land and parcels
What the maps cover in Corson
Who publishes each layer, how good it is, and when we last checked.
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Parcels Missing
No public parcel map found for Corson County yet. Lot lines and owners of record are kept by the county (corson.sdcounties.org).
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Address points Missing
No public address points layer found for Corson 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
Corson 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
Corson County's official site
We have found the county's site but not its offices yet; start there.
County government
- County government
The official website of Corson County.
See your own lot on these maps
Open Corson 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 Corson County
- When was Corson County founded?
- Corson County was founded in 1909, formed from Dewey County, Schnasse County, Boreman County and Walworth County, and named after Dighton Corson.
- What is the county seat of Corson County?
- The county seat of Corson County is McIntosh.
- Is there an online parcel map for Corson County?
- Not that we have found yet. Lot lines and owners of record are kept by the county assessor's office. When a public parcel map appears, it shows here.
- Has Corson County's boundary or name changed?
- Corson County was created in 1909 from Dewey County, Schnasse County, Boreman County and Walworth County. Since then the Atlas of Historical County Boundaries records 1 later change, chiefly involving Walworth County.
- Is my lot in a flood zone?
- We do not have flood maps for Corson County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby