County · code 46037
Day CountySouth Dakota
Day County is a county in northeastern South Dakota with its seat in Webster. The county was formed in 1880 and became part of South Dakota in 1889.
- Founded1880
- County seatWebster
- Land area1,028 sq mi + 63 sq mi water
- Population5,449 2020 Census
- Parcels mapped11,382 checked 15 October 2026
Where it is
Day 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 1880
An old deed may name a county that no longer exists, or a boundary that has since moved.
Day County was established in 1880 in Dakota Territory. On March 8, 1889, Day County gained territory from Grant County. On November 2, 1889, Day County became a county in the state of South Dakota.
- 1889Gained territory Day gained from Grant and gained all of Non-County Area 19; Non-County Area 19 eliminated. · Dak. Terr. Laws 1889, 18th sess., ch. 55/p. 81
- 1889Became part of South Dakota Day 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 Day
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 11,382 parcels from Day 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 Day 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
Day 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
Day 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 Day County.
See your own lot on these maps
Open Day 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 Day County
- When was Day County founded?
- Day County was founded in 1880.
- What is the county seat of Day County?
- The county seat of Day County is Webster.
- Is there an online parcel map for Day County?
- Yes. Day County publishes a parcel map of 11,382 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has Day County's boundary or name changed?
- Atlas of Historical County Boundaries records 2 changes for Day County. Since then the Atlas of Historical County Boundaries records 2 later changes, chiefly involving Grant County.
- Is my lot in a flood zone?
- We do not have flood maps for Day County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby