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| County | Date Formed | Parent County | County Seat | County Coordinator |
| Albany | 1858 | Original County | Laramie |
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| Big Horn | 1890 | Fremont, Johnson | Basin |
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| Campbell | 1911 | Crook, Weston | Gillette | Jeanne Challoner |
| Carbon | 1868 | Original County | Rawlins |
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| Converse | 1888 | Laramie, Albany | Douglas |
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| Crook | 1885 | Pease | Sundance | Jeanne Challoner |
| Fremont | 1884 | Sweetwater | Lander |
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| Goshen | 1911 | Platte, Laramie | Torrington | Colleen Pustola |
| Hot Springs | 1911 | Fremont | Thermopolis | Billie Erin Walsh |
| Johnson | 1875 | Pease | Buffalo | Rebecca Maloney |
| Laramie | 1867 | Original County | Cheyenne |
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| Lincoln | 1913 | Uinta | Kemmerer |
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| Natrona | 1888 | Carbon | Casper | Bob Jenkins |
| Niobrara | 1911 | Converse | Lusk | Suzanne Leonard |
| Park | 1909 | Big Horn | Cody |
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| Platte | 1913 | Laramie | Wheatland |
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| Sheridan | 1888 | Johnson | Sheridan | Suzanne Leonard |
| Sublette | 1921 | Fremont | Pinedale |
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| Sweetwater | 1867 | Originally Carter County | Green River | Angela M. Cable |
| Teton | 1921 | Lincoln | Jackson |
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| Uinta | 1869 | Original County | Evanston |
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| Washakie | 1911 | Big Horn, Johnson | Worland |
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| Weston | 1890 | Crook | Newcastle | Jeanne Challoner |
| Wind River Reservation | Est. 1851 | Sweetwater, Fremont | Ft. Washakie | Rebecca Maloney |
| Unknown County | Rebecca Maloney |
