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These codes were in use from 1922 through the expiration of the 1975 baseplate in 1978.

County Code #: County (County Seat)

00: Non-Resident 1: Adair (Greenfield) 2: Adams (Corning) 3: Allamakee (Waukon) 4: Appanoose (Centerville) 5: Audubon (Audubon) 6: Benton (Vinton) 7: Black Hawk (Waterloo) 8: Boone (Boone) 9: Bremer (Waverly) 10: Buchanan (Independence) 11: Buena Vista (Storm Lake) 12: Butler (Allison) 13: Calhoun (Rockwell City) 14: Carroll (Carroll) 15: Cass (Atlantic) 16: Cedar (Tipton) 17: Cerro Gordo (Mason City) 18: Cherokee (Cherokee) 19: Chickasaw (New Hampton) 20: Clarke (Osceola) 21: Clay (Spencer) 22: Clayton (Elkader) 23: Clinton (Clinton) 24: Crawford (Denison) 25: Dallas (Adel) 26: Davis (Bloomfield) 27: Decatur (Leon) 28: Delaware (Manchester) 29: Des Moines (Burlington) 30: Dickinson (Spirit Lake) 31: Dubuque (Dubuque) 32: Emmet (Estherville) 33: Fayette (West Union)

34: Floyd (Charles City) 35: Franklin (Hampton) 36: Fremont (Sidney) 37: Greene (Jefferson) 38: Grundy (Grundy Center) 39: Guthrie (Guthrie Center) 40: Hamilton (Webster City) 41: Hancock (Garner) 42: Hardin (Eldora) 43: Harrison (Logan) 44: Henry (Mount Pleasant) 45: Howard (Cresco) 46: Humboldt (Dakota City) 47: Ida (Ida Grove) 48: Iowa (Marengo) 49: Jackson (Maquoketa) 50: Jasper (Newton) 51: Jefferson (Fairfield) 52: Johnson (Iowa City) 53: Jones (Anamosa) 54: Keokuk (Sigourney) 55: Kossuth (Algona) 56: Lee (Fort Madison) 57: Linn (Cedar Rapids) 58: Louisa (Wapello) 59: Lucas (Charlton) 60: Lyon (Rock Rapids) 61: Madison (Winterset) 62: Mahaska (Oskaloosa) 63: Marion (Knoxville) 64: Marshall (Marshalltown) 65: Mills (Glenwood) 66: Mitchell (Osage)

67: Monona (Onawa) 68: Monroe (Albia) 69: Montgomery (Red Oak) 70: Muscatine (Muscatine) 71: O'Brien (Primghar) 72: Osceola (Sibley) 73: Page (Clarinda) 74: Palo Alto (Emmetsburg) 75: Plymouth (LeMars) 76: Pocahontas (Pocahontas) 77: Polk (Des Moines) 78: Pottawattamie (Council Bluffs) 79: Poweshiek (Montezuma) 80: Ringgold (Mount Ayr) 81: Sac (Sac City) 82: Scott (Davenport) 83: Shelby (Harlan) 84: Sioux (Orange City) 85: Story (Nevada) 86: Tama (Toldeo) 87: Taylor (Bedford) 88: Union (Creston) 89: Van Buren (Keosauqua) 90: Wappelo (Ottumwa) 91: Warren (Indianola) 92: Washington (Washington) 93: Wayne (Corydon) 94: Webster (Fort Dodge) 95: Winnebago (Forest City) 96: Winneshiek (Decorah) 97: Woodbury (Sioux City) 98: Worth (Northwood) 99: Wright (Clarion)

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