County · code 46051
Grant CountySouth Dakota
Grant County is a county in South Dakota, on the border with Minnesota, founded in 1873, with its seat at Milbank.
- Founded1873
- County seatMilbank
- Named forUlysses S. Grant
- Land area681 sq mi + 6.1 sq mi water
- Population7,556 2020 Census
- Parcels mapped8,926 checked 14 October 2026
Where it is
Grant 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 1873
An old deed may name a county that no longer exists, or a boundary that has since moved.
Grant County became a county in the state of South Dakota on November 2, 1889. On March 8, 1889, Grant lost territory to Day County.
- 1889
- 1889Became part of South Dakota Grant 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 Grant
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 8,926 parcels from Grant County. Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
checked 14 October 2026 -
Address points Missing
No public address points layer found for Grant County yet.
-
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
Grant 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
Grant 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 Grant County.
See your own lot on these maps
Open Grant 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 Grant County
- When was Grant County founded?
- Grant County was founded in 1873, and named after Ulysses S. Grant.
- What is the county seat of Grant County?
- The county seat of Grant County is Milbank.
- Is there an online parcel map for Grant County?
- Yes. Grant County publishes a parcel map of 8,926 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has Grant County's boundary or name changed?
- Atlas of Historical County Boundaries records 2 changes for Grant County. Since then the Atlas of Historical County Boundaries records 2 later changes, chiefly involving Day. County.
- Is my lot in a flood zone?
- We do not have flood maps for Grant County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby