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| County | Date Formed | Parent County | County Seat | County Coordinator |
| Albany | 1858 | Original County | Laramie | Grace Kirby |
| Big Horn | 1890 | Fremont, Johnson | Basin |
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| Campbell | 1911 | Crook, Weston | Gillette | Grace Kirby |
| Carbon | 1868 | Original County | Rawlins |
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| Converse | 1888 | Laramie, Albany | Douglas |
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| Crook | 1885 | Pease | Sundance | Michelle Ramos |
| Fremont | 1884 | Sweetwater | Lander |
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| Goshen | 1911 | Platte, Laramie | Torrington | Colleen Pustola |
| Hot Springs | 1911 | Fremont | Thermopolis |
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| Johnson | 1875 | Pease | Buffalo | Edward A. Black, Sr. |
| Laramie | 1867 | Original County | Cheyenne | Art Michaelis |
| Lincoln | 1913 | Uinta | Kemmerer | Kevin Haddenham |
| Natrona | 1888 | Carbon | Casper | Grace Kirby |
| Niobrara | 1911 | Converse | Lusk | Suzanne Leonard |
| Park | 1909 | Big Horn | Cody |
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| Platte | 1913 | Laramie | Wheatland | Edward A. Black, Sr. |
| Sheridan | 1888 | Johnson | Sheridan | Suzanne Leonard |
| Sublette | 1921 | Fremont | Pinedale | Kendrah A. Justesen |
| Sweetwater | 1867 | Originally Carter County | Green River | Kendrah A. Justesen |
| Teton | 1921 | Lincoln | Jackson |
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| Uinta | 1869 | Original County | Evanston | Kevin Haddenham |
| Washakie | 1911 | Big Horn, Johnson | Worland | Robert W. Paris |
| Weston | 1890 | Crook | Newcastle | JhaRee Miller |
| Wind River Reservation | Est. 1851 | Sweetwater, Fremont | Ft. Washakie | Theresa Ryder |
