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County license plate prefixes
County License Number Prefixes
Wyoming license plate numbers begin with a prefix number that designates the county in which the vehicle is registered. Below are the county designations, and the town in which each county treasurer's office is located.
| License # | County | County Seat |
| | | |
| 1 | Natrona | Casper |
| 2 | Laramie | Cheyenne |
| 3 | Sheridan | Sheridan |
| 4 | Sweetwater | Green River |
| 5 | Albany | Laramie |
| 6 | Carbon | Rawlins |
| 7 | Goshen | Torrington |
| 8 | Platte | Wheatland |
| 9 | Big Horn | Basin |
| 10 | Fremont | Lander |
| 11 | Park | Cody |
| 12 | Lincoln | Kemmerer |
| 13 | Converse | Douglas |
| 14 | Niobrara | Lusk |
| 15 | Hot Springs | Thermopolis |
| 16 | Johnson | Buffalo |
| 17 | Campbell | Gillette |
| 18 | Crook | Sundance |
| 19 | Uinta | Evanston |
| 20 | Washakie | Worland |
| 21 | Weston | Newcastle |
| 22 | Teton | Jackson |
| 23 | Sublette | Pinedale |
