County · code 46007
Bennett CountySouth Dakota
Bennett County is a county in South Dakota with its seat in Martin. The county was formed on June 3, 1909.
- Founded1909
- County seatMartin
- Named forGranville G. Bennett
- Land area1,185 sq mi + 5.8 sq mi water
- Population3,381 2020 Census
- Parcels mapped4,641 checked 14 October 2026
Where it is
Bennett 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 Lugenbeel County, Shannon County, Washabaugh County, Washington County and Fall River County
An old deed may name a county that no longer exists, or a boundary that has since moved.
Bennett County was created on June 3, 1909, from Lugenbeel, Shannon, Washabaugh, and Washington counties, with Lugenbeel eliminated. The county was named after Granville G. Bennett. Initially not fully organized, Bennett was attached to Fall River County for judicial purposes until it was fully organized and detached on April 27, 1912. Bennett lost territory to Todd County on March 2, 1911.
- 1909Bennett County created Bennett created from Lugenbeel (extinct), Shannon, Washabaugh (extinct), and Washington (extinct); Lugenbeel eliminated. Bennett not fully organized, attached to Fall River “for judicial purposes.” · S. Dak. Laws 1909, 11th sess., ch. 280/pp. 427-429
- 1911
- 1912Changed Bennett fully organized, detached from Fall River. · HRS S. Dak., Bennett, 7; "Dakota's Counties," 13
Land and parcels
What the maps cover in Bennett
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 4,641 parcels from Bennett 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 Bennett 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
Bennett by the Census
Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.
See your own lot on these maps
Open Bennett 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 Bennett County
- When was Bennett County founded?
- Bennett County was founded in 1909, formed from Lugenbeel County, Shannon County, Washabaugh County, Washington County and Fall River County, and named after Granville G. Bennett.
- What is the county seat of Bennett County?
- The county seat of Bennett County is Martin.
- Is there an online parcel map for Bennett County?
- Yes. Bennett County publishes a parcel map of 4,641 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has Bennett County's boundary or name changed?
- Bennett County was created in 1909 from Lugenbeel County, Shannon County, Washabaugh County, Washington County and Fall River County. Since then the Atlas of Historical County Boundaries records 2 later changes, chiefly involving Fall River County and Todd County.
- Is my lot in a flood zone?
- We do not have flood maps for Bennett County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby