County · code 46057
Hamlin CountySouth Dakota
Hamlin County is in South Dakota with its seat in Hayti. It was formed in 1873 and named after Hannibal Hamlin.
- Founded1873
- County seatHayti
- Named forHannibal Hamlin
- Land area507 sq mi + 31 sq mi water
- Population6,164 2020 Census
- Parcels mapped8,131 checked 15 October 2026
Where it is
Hamlin 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.
Hamlin County gained from Clark and lost to the creation of Codington on February 15, 1877. It became a county in the state of South Dakota on November 2, 1889.
- 1877Gained territory Hamlin gained from Clark, lost to creation of Codington. · Dak. Terr. Laws 1877, 12th sess., ch. 42/pp. 217-218 in Rev. Codes Dak. 1877
- 1889Became part of South Dakota Hamlin 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 Hamlin
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 8,131 parcels from Hamlin 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 Hamlin 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
Hamlin 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
Hamlin 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 Hamlin County.
See your own lot on these maps
Open Hamlin 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 Hamlin County
- When was Hamlin County founded?
- Hamlin County was founded in 1873, and named after Hannibal Hamlin.
- What is the county seat of Hamlin County?
- The county seat of Hamlin County is Hayti.
- Is there an online parcel map for Hamlin County?
- Yes. Hamlin County publishes a parcel map of 8,131 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has Hamlin County's boundary or name changed?
- Atlas of Historical County Boundaries records 2 changes for Hamlin County. Since then the Atlas of Historical County Boundaries records 2 later changes, chiefly involving Clark County and Codington County.
- Is my lot in a flood zone?
- We do not have flood maps for Hamlin County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby