Counties & Municipalities

County Designations on License Plates

Map of Counties color.jpg

Wyoming's county designation numbers were assigned by a committee and are partially based upon the assessed valuation of each county around 1930, when the numbers were first assigned. These numbers are frequently used as short hand when referring to particular counties, most notably on the license plate. The numbers were first added to the license plate in 1930.

1. Natrona
2. Laramie
3. Sheridan
4. Sweetwater
5. Albany
6. Carbon
7. Goshen
8. Platte
9. Big Horn
10. Fremont
11. Park
12. Lincoln
13. Converse
14. Niobrara
15. Hot Springs
16. Johnson
17. Campbell
18. Crook
19. Uinta
20. Washakie
21. Weston
22. Teton
23. Sublette


County Organization


Carved from sections of Dakota, Utah and Idaho Territories, Wyoming Territory came into existence by an act of Congress on July 25, 1868. The territorial government was formally inaugurated May 19, 1869. The first Territorial Governor, John A. Campbell, was appointed by President Ulysses S. Grant and took his oath of office on April 15, 1869.

At the time of its organization, Wyoming had already been divided into four counties: Laramie (established January 9, 1867), Carter—later Sweetwater (established December 27, 1867, Carbon and Albany (both established December 16, 1868). These counties extended from the Northern to the southern borders of the territory. Upon the organization of Wyoming Territory, a portion of modern-day Utah and Idaho, extending from Montana to the Wyoming-Utah boundary—including what became Yellowstone National Park—was annexed and named Uinta County. As the territory, and later state, became settled, other counties were carved out of these original five. Since 1921, when the last one was created, there have been twenty-three counties in the State of Wyoming.

Timeline of Wyoming's Counties

County
Created
Organized
Carved From
Laramie
1867
1867
Original
Sweetwater (Carter)
1867
1867
Original
Albany
1868
1868
Original
Carbon
1868
1868
Original
Uinta
1869
1869
Original
Crook
1875
1885
Albany, Laramie
Johnson (Pease)
1875
1881
Carbon, Sweetwater
Fremont
1884
1884
Sweetwater
Converse
1888
1888
Albany, Laramie
Natrona
1888
1890
Carbon
Sheridan
1888
1888
Johnson
Big Horn
1890
1897
Fremont, Johnson, Sheridan
Weston
1890
1890
Crook
Park
1909
1911
Big Horn
Campbell
1911
1913
Crook, Weston
Goshen
1911
1913
Laramie
Hot Springs
1911
1913
Big Horn, Fremont, Park
Lincoln
1911
1913
Uinta
Niobrara
1911
1913
Converse
Platte
1911
1913
Laramie
Washakie
1911
1913
Big Horn
Sublette
1921
1923
Fremont, Lincoln
Teton
1921
1922
Lincoln


Additional Resources