Sweetwater County, Wyoming Genealogy

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United StatesGotoarrow.png Wyoming Gotoarrow.png Sweetwater County

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

County Information


Sweetwater County was organized in 1867. It is located in the most southwestern area of the state. Its county seat is Green River.[1] It was named for Sweetwater River. [2]

County Courthouse

Sweetwater County Courthouse
80 W Flaming Gorge Way
PO Box 730
Green River, WY 82935
Phone: 307.872.6400
Sweetwater County Website

County Clerk has marriage records from 1864 and land records from 1876. Clerk of the District Court has divorce, probate and court records.[3]

Sweetwater 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: Formed from the western half of Laramie county 27 Dec 1867 (Laramie county originally encompassed the entire state). Originally named Carter county and original county seat South Pass City. The county was renamed Sweetwater by the first Wyoming Legislative Assembly. The county seat was moved to Green River in 1873.
  • County Seat: Green River
For animated maps illustrating Wyoming County boundary changes, "Rotating Formation Wyoming County Boundary Maps" (1848-1965) may be viewed for free at the MapofUS.org website.

Populated Places

The following are locations in the county:[4]

  • Burntfork
  • Creston
  • Monell (Hist)
  • Quealy
  • Salt Wells
Unincorporated communites
Census-designated places
Ghost towns

County Facts
County seat: Green River
Organized: December 27, 1867
Parent County(s): the western half of Laramie [5]
Neighboring Counties
Carbon  • Daggett (UT)  • Fremont  • Lincoln  • Moffat (CO)  • Sublette  • Summit (UT)  • Uinta
See County Maps
Sweetwater County Courthouse, Green River, Wyoming.jpg
Location Map
This page is available for adoption


Bible Records


Business, Commerce, and Occupations


Cemeteries of Sweetwater 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 Sweetwater county cemeteries.

Census Records

Historical populations
Census Pop.  %±
1870 1,916
1880 2,561 33.7%
1890 4,941 92.9%
1900 8,455 71.1%
1910 11,575 36.9%
1920 13,640 17.8%
1930 18,165 33.2%
1940 19,407 6.8%
1950 22,017 13.4%
1960 17,920 −18.6%
1970 18,391 2.6%
1980 41,723 126.9%
1990 38,823 −7.0%
2000 37,613 −3.1%
2010 43,806 16.5%
Source: "Wikipedia.org"

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 Sweetwater 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.

LDS Ward and Branch Records

  • Green River, McKinnon, Reliance, Rock Springs,Rock Springs 1st, Rock Springs 2nd, Superior, Winton

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 Sweetwater 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



Early migration routes to and from Sweetwater County, Wyoming Genealogy for European and African American settlers included:

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

  • U.S. Newspaper Directory, 1690-Present on Chronicling America - contains a list of all known newspapers and the dates they cover; once you locate a newspaper name, contact the local library to see if they have copies of the newspaper


Other Records

Public Records

1882 Poll Book for Green River, Sweetwater County, Wyoming.


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- Sweetwater - Probate records.

The bulk of the probate case files from the 1870's to the 1940's have been transferred to the Wyoming State Archives in Cheyenne. Check their website for additional details.

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




  • Wyoming Death Index at Wyoming State Archives — index (currently contains only A-E, it is a work in progress)


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


  • Sweetwater County Library
    300 N 1st E St
    Green River, WY 82935, USA
    Phone: 307-875-3615
    Director: Jason Grubb
    Email: jgrubb@sweetwaterlibraries.com
  • White Mountain Library
    2935 Sweetwater Dr
    Rock Springs, WY 82901, USA
    Phone: 307-362-2665
    Michelle Maser, Manager: 307-362-2665 x3120
    Email: mmaser@sweetwaterlibraries.com
  • Rock Springs Library
    400 C St
    Rock Springs, WY 82901, USA
    Phone: 307-352-6667
    Lindsey Travis, Manager: 307-352-6669
    Email: ltravis@sweetwaterlibraries.com


Research Guides


  1. http://genealogytrails.com/wyo/sweetwater/ accessed 11/15/2016
  2. https://en.wikipedia.org/wiki/Sweetwater_County,_Wyoming accessed 11/15/2016
  3. The Handybook for Genealogists : United States of America, 10th ed., (Draper, UT: Everton Publishers, 2002), p. 767. Sweetwater County, Wyoming
  4. Wikipedia contributors, "Sweetwater County, Wyoming," in Wikipedia: the Free Encyclopedia, https://en.wikipedia.org/wiki/Sweetwater_County,_Wyoming#Communities accessed 29 November 2016.
  5. The Handybook for Genealogists: United States of America,10th ed. (Draper, UT: Everton Publishers, 2002).
  6. Jim Tompkins, "The Oregon Trail 1841-1848 Map IV" in Oregon Trail Landmarks at http://www.oregonpioneers.com/OTMap4.jpg (accessed 18 July 2011).
  7. "Oregon California Trails Association" at http://octatrails.micromaps.com/ (accessed 18 July 2011).
  8. "The Pioneer Story: The Mormon Pioneer Trail" in The Church of Jesus Christ of Latter-day Saints at http://lds.org/gospellibrary/pioneer/pioneerstory.htm (accessed 18 July 2011).
  9. Wikipedia contributors, "Cherokee Trail" in Wikipedia: the Free Encyclopedia at http://en.wikipedia.org/wiki/Cherokee_Trail (accessed 19 July 2011).