Day County, South Dakota Genealogy
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- 1 County Courthouse
- 2 History
- 3 Places/Localities
- 4 Resources
- 5 Societies and Libraries
- 6 Web Sites
- 7 References
- 1879--Day County was created 1 October 1879 from Greeley, Eliminated 1 Oct. 1879, and Stone, Eliminated 1 Oct. 1879, Counties. County seat: Webster 
A portion of the Lake Traverse Indian Reservation is in Day County. The remainder of the reservation is in Marshall, Roberts, and Codington Counties in South Dakota and in Richland and Sargent Counties in North Dakota.
1905, 1915, 1925 State Censuses --Unique information could include: Ethnic Background, Maiden Name, Church Affiliation & Military Service
1905 state census with images can be viewed free at FamilySearch Record Search
1915 state census with images can be viewed free at FamilySearch Record Search
1925 state census with images can be viewed free at FamilySearch Record Search
Societies and Libraries
- USGenWeb project. May have maps, name indexes, history or other information for this county. Select the state, then the county.
- Family History Library Catalog
- The Handybook for Genealogists: United States of America,10th ed. (Draper, UT:Everton Publishers, 2002).