County · code 46085
Lyman CountySouth Dakota
Lyman County is a county in South Dakota, with its seat at Kennebec. It was created in 1873 from Gregory County by Dakota Territory.
- Founded1873
- County seatKennebec
- Land area1,642 sq mi + 65 sq mi water
- Population3,718 2020 Census
Where it is
Lyman 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 1873 from Gregory County
An old deed may name a county that no longer exists, or a boundary that has since moved.
Lyman County was created on January 8, 1873, from Gregory County and Non-County Area 1 in Dakota Territory. It became a county in the state of South Dakota on November 2, 1889, and was fully organized and detached from Brule County on May 21, 1893. Over the following decades, Lyman County gained and lost territory through various boundary adjustments, including gaining from Gregory, Presho, Tripp, Jackson, and Pratt counties, and losing to Gregory County.
- 1873Lyman County created Lyman created by Dakota Territory in present South Dakota from Gregory and Non-County Area 1. Lyman not fully organized, not attached. · Dak. Terr. Laws 1872, 10th sess., ch. 19, sec. 3/p. 45
- 1889Became part of South Dakota Lyman 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
- 1891Gained territory Lyman gained from Gregory, Presho (extinct), and Tripp. · S. Dak. Laws 1891, 2d sess., ch. 41/p. 101
- 1907Eliminated Presho eliminated, ending its attachment to Lyman.into Presho· S. Dak. Laws 1907, 10th sess., ch. 99/p. 148
- 1909Eliminated Mellette and Todd attached to Lyman “for judicial purposes.” Meyer and Pratt eliminated, ending their attachment to Lyman. · S. Dak. Laws 1909, 11th sess., ch. 280/pp. 427-429
Show all 17 changes
- 1873Lyman County created Lyman created by Dakota Territory in present South Dakota from Gregory and Non-County Area 1. Lyman not fully organized, not attached. · Dak. Terr. Laws 1872, 10th sess., ch. 19, sec. 3/p. 45
- 1889Became part of South Dakota Lyman 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
- 1890Changed Lyman attached to Brule “for the levy and collection of taxes therein.” · S. Dak. Laws 1890, 1st sess., ch. 65/p. 159
- 1891Gained territory Lyman gained from Gregory, Presho (extinct), and Tripp. · S. Dak. Laws 1891, 2d sess., ch. 41/p. 101
- 1893Changed Attachment of Lyman to Brule “for judicial purposes” was confirmed. · S. Dak. Laws 1893, 3d sess., ch. 49/p. 78
- 1893
- 1895
- 1897
- 1898Gained territory Lyman gained from Jackson, Nowlin (extinct), Pratt (extinct), Presho (extinct), and Non-County Area 7; Nowlin eliminated. Lyman lost to creation of Non-County Area 22. · S. Dak. Laws 1897, 5th sess., ch. 45/p. 96
- 1907Eliminated Presho eliminated, ending its attachment to Lyman.into Presho· S. Dak. Laws 1907, 10th sess., ch. 99/p. 148
- 1909Changed Attachment of Meyer (extinct) to Lyman “for judicial purposes” was confirmed.Meyer· S. Dak. Laws 1909, 11th sess., ch. 53/p. 82
- 1909Eliminated Mellette and Todd attached to Lyman “for judicial purposes.” Meyer and Pratt eliminated, ending their attachment to Lyman. · S. Dak. Laws 1909, 11th sess., ch. 280/pp. 427-429
- 1909
- 1911Changed Mellette fully organized, detached from Lyman. · Mellette County, 4; HRS S. Dak., Mellette, 3
- 1916Lost territory Lyman lost to creation of Jones. · Proving Up, 20; S. Dak. Comp. Laws 1929, 1:147; S. Dak. Code 1939, 1:325
- 1919Changed Attachment of Todd to Lyman “for judicial purposes” was confirmed. · S. Dak. Laws 1918, 15th sess., spec., ch. 354/p. 434
- 1923
Land and parcels
What the maps cover in Lyman
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 Lyman County yet. Lot lines and owners of record are kept by the county (lymancounty.org).
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Address points Missing
No public address points layer found for Lyman 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
Lyman 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
Lyman 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 Lyman County.
See your own lot on these maps
Open Lyman 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 Lyman County
- When was Lyman County founded?
- Lyman County was founded in 1873, formed from Gregory County.
- What is the county seat of Lyman County?
- The county seat of Lyman County is Kennebec.
- Is there an online parcel map for Lyman 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 Lyman County's boundary or name changed?
- Lyman County was created in 1873 from Gregory County. Since then the Atlas of Historical County Boundaries records 16 later changes, chiefly involving Brule County, Presho County and Tripp County.
- Is my lot in a flood zone?
- We do not have flood maps for Lyman County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby