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These codes were first used in 1930 and remain in use through the present. They were initially assigned in descending order of total property valuation within the county.

County Code #: 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) 99: Rental/Fleet

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