Crook County, Wyoming Genealogy

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United States

Crook County

Guide to Crook County, Wyoming ancestry, genealogy and family history, birth records, marriage records, death records, census records, family history, and military records.

County Information


County Courthouse

Crook County Courthouse
309 Cleveland Street
PO Box 37
Sundance, WY 82729-0037
Phone: 307.283.1323
Crook County Website

County Clerk has marriage and land records from 1855.
Clerk of the court has divorce, probate and court records.[1]

Crook County, Wyoming Record Dates

Beginning Dates for Major County Records
Birth* Marriage Death* Court Land Probate Census
* For earlier dates, try... Church | Obituaries | Cemeteries

Record Loss

There is no known history of courthouse disasters in this county.

Boundary Changes

  • Parent County: organized 8 December 1875 from Laramie and Albany counties.
  • County seat: Sundance [2]
For animated maps illustrating Wyoming County boundary changes, "Rotating Formation Wyoming County Boundary Maps" (1848-1965) may be viewed for free at the website.

Populated Places

The following are locations in the county:[3]

Unincorporated communites
Census-designated places
Uncategorized Places
  • Carlile
  • Carlile Junction
  • Colony
  • Devils Tower
  • Hay Creek (hist.)
  • Lightning Flat (hist.)
  • New Haven
  • Oshoto

County Facts
County seat: Sundance
Organized: December 8, 1875
Parent County(s): Laramie and Albany [4]
Neighboring Counties
Butte (SD)  • Campbell  • Carter (MT)  • Lawrence (SD)  • Powder River (MT)  • Weston
See County Maps
Crook County Courthouse, Sundance, Wyoming.jpg
Location Map
This page is available for adoption


Bible Records


Business, Commerce, and Occupations


Cemeteries of Crook County, Wyoming online and in print
Tombstone Transcriptions Online
Tombstone Transcriptions in
more complete
List of Cemeteries in the County
See Wyoming Cemeteries for more information

The following web site has additional information on Crook county cemeteries.

Census Records

Historical populations
Census Pop.  %±
1880 239
1890 2,338 878.2%
1900 3,137 34.2%
1910 6,492 106.9%
1920 5,524 −14.9%
1930 5,333 −3.5%
1940 5,463 2.4%
1950 4,738 −13.3%
1960 4,691 −1.0%
1970 4,535 −3.3%
1980 5,308 17.0%
1990 5,294 −0.3%
2000 5,887 11.2%
2010 7,083 20.3%
Source: "".

State Census Records

Federal Census Records

Federal Censuses were taken for Wyoming starting in 1850. For links to Federal census indexes, see Wyoming Census.

For tips on accessing Crook County, Wyoming Genealogy census records online, see: Wyoming Census.

Church Records

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 Wyoming denominations, view the Wyoming Church Records wiki page.

Court Records


Emigration and Immigration

Ethnic, Political, and Religious Groups

Funeral Homes



Land and Property Records

Online Land Records

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 Wyoming Land and Property for additional information about early Wyoming 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

Local histories are available for Crook County, Wyoming Genealogy. County and town histories may include biographies, church, school and government history, and military information. For more information about local histories, see the wiki page section Wyoming Local Histories.

Maps and Gazetteers



Military Records

Civil War
No known military units were raised specifically from Wyoming as it did not become a state until 1890. However men from the territories that became Wyoming fought in other units during the Civil War.

World War I

For further information see Wyoming Military Records.

Naturalization and Citizenship


Wyoming Newspapers Online

Wyoming Newspaper Catalogs


Other Records


Probate Records

In most counties in Wyoming, probate records have been kept by the county judge. They include wills, fee books, claim registers, legacy records, inheritance records, probate ticklers, and dockets. The records are available at the county courthouse.

The FamilySearch Catalog lists films of probate records. To find the records for this county, use the Place Search for Wyoming- Crook - Probate records.

School Records

Tax Records

Wyoming 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

Vital Records consist of births, adoptions, marriages, divorces, and deaths recorded on registers, certificates, and documents. See the CDC Where to Write website for information on acquiring copies of these records.

See also How to order Wyoming Vital Records, order electronically online $ or download an application for Wyoming Birth Certificate, Marriage or Divorce Certificate, Death Certificate Applications to mail. For records more than 50 years old visit Wyoming State Archives





Research Facilities


Family History Centers

Family History Centers provide one-on-one assistance and free access to premium genealogical websites. In addition, many centers have free how-to genealogy classes.




County, Township and City Societies


  • Crook County Library
    414 E. Main Street
    PO Box 910
    Sundance, Wyoming 82729
    Phone: (307) 283-1006, 283-1008
    Fax: (307) 283-1006
    Email --


  • Crook County Library
    414 E. Main Street
    PO Box 910
    Sundance, Wyoming 82729
    Phone: (307) 283-1006, 283-1008
    Fax: Fax (307) 283-1006Email --


Research Guides


  1. The Handybook for Genealogists : United States of America, 10th ed., (Draper, UT: Everton Publishers, 2002), p. 766. Crook County, Wyoming
  2. The Handybook for Genealogists: United States of America,10th ed. (Draper, UT:Everton Publishers, 2002).
  3. Wikipedia contributors, "Crook County, Wyoming," in Wikipedia: the Free Encyclopedia,,_Wyoming#Communities accessed 19 November 2016.
  4. The Handybook for Genealogists: United States of America,10th ed. (Draper, UT: Everton Publishers, 2002).

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