Dewey County, South Dakota Genealogy

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Online Records

Dewey County, South Dakota genealogy and family history research page. Guide to genealogy, history, and courthouse sources including birth records, marriage records, death records, census records, wills, deeds and land records, Civil War records, family histories, cemeteries, churches, tax records, newspapers, and obituaries.

Dewey County, South Dakota
Map of South Dakota highlighting Dewey County
Location in the state of South Dakota
Map of the U.S. highlighting South Dakota
Location of South Dakota in the U.S.
Founded January 8, 1873
County Seat Timber Lake
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County Courthouse

Dewey County Courthouse
710 C Street; PO Box 117;
Timber Lake, SD 57656
 Phone: 605.865.3661 

Register of Deeds has birth, marriage and land record from 1910,
death records from 1911, cemetery records from 1941 and military
records from 1919; Clerk Court has divorce and probate records
from 1911 and court records from 1910; County Auditor has school
census records 1911-1972[1]


Parent County

1873--Dewey County was created 8 January 1873 from unorganized territory.
County seat: Timber Lake [2]

Boundary Changes

Record Loss


Populated Places

Indian Reservation

A major portion of the Cheyenne River Indian Reservation is located in Dewey County. The remainder of the reservation is in Ziebach County.

Neighboring Counties




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

   1935 state census with images can be viewed free at FamilySearch Record Search

   1945 state census with images can be viewed free at FamilySearch Record Search


Church records vary significantly depending on the denomination and the record keeper. They may contain information about members of the congregation, such as age, date of baptism, christening, or birth; marriage information and maiden names; and death date. For general information about South Dakota denominations, view the South Dakota Church Records wiki page.



Land and property records can place an ancestor in a particular location, provide economic information, and reveal family relationships. Land records include: deeds, abstracts and indexes, mortgages, leases, grants and land patents.

See South Dakota Land and Property for additional information about early South Dakota land grants. After land was transferred to private ownership, subsequent transactions were usually recorded at the county courthouse, where records are currently housed.

Local Histories






South Dakota tax records complement land records and can be used to supplement the years between censuses. There may be gaps of several years in the records.

Vital Records

Societies and Libraries

Family History Centers

Web Sites

  • USGenWeb project. May have maps, name indexes, history or other information for this county. Select the state, then the county.
  • Family History Library Catalog


  1. The Handybook for Genealogists : United States of America, 10th ed., (Draper, UT: Everton Publishers, 2002)Dewey County, South Dakota, p.624
  2. The Handybook for Genealogists: United States of America,10th ed. (Draper, UT:Everton Publishers, 2002).