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These codes were established in 1963 and have been used continuously through the present.

County Code #: County (County Seat)

1: Adams (Decatur) 2: Allen (Ft. Wayne) 3: Bartholomew (Columbus) 4: Benton (Fowler) 5: Blackford (Hartford City) 6: Boone (Lebanon) 7: Brown (Nashville) 8: Carrol (Delphi) 9: Cass (Loganport) 10: Clark (Jeffersonville) 11: Clay (Brazil) 12: Clinton (Frankfort) 13: Crawford (English) 14: Daviess (Washington) 15: Dearborn (Lawrenceburg) 16: Decatur (Greensburg) 17: Dekalb (Auburn) 18: Delaware (Muncie) 19: Dubois (Jasper) 20: Elkhart (Goshen) 21: Fayette (Connerville) 22: Floyd (New Albany) 23: Fountain (Covington) 24: Franklin (Brookville) 25: Fulton (Rochester) 26: Gibson (Princeton) 27: Grant (Marion) 28: Green (Bloomfield) 29: Hamilton (Noblesville) 30: Hancock (Greenfield) 31: Harrison (Corydon) 32: Hendricks (Dansville) 33: Henry (New Castle)

34: Howard (Kokomo) 35: Huntington (Huntington) 36: Jackson (Brownstown) 37: Jasper (Rensselaer) 38: Jay (Portland) 39: Jefferson (Madison) 40: Jennings (Vernon) 41: Johnson (Franklin) 42: Knox (Vincennes) 43: Kosciusko (Warsaw) 44: Lagrange (Lagrange) 45: Lake (Crown Point) 46: La Porte (La Porte) 47: Lawrence (Bedford) 48: Madison (Anderson) 49: Marion (Indianapolis) 50: Marshall (Plymouth) 51: Martin (Shoals) 52: Miami (Peru) 53: Monroe (Bloomington) 54: Montgomery (Crawfordsville) 55: Morgan (Martinsville) 56: Newton (Kentland) 57: Noble (Albion) 58: Ohio (Rising Sun) 59: Orange (Paoli) 60: Owen (Spencer) 61: Parke (Rockville) 62: Perry (Cannelton) 63: Pike (Petersburg) 64: Porter (Valpariso) 65: Posry (Mt. Vernon) 66: Pulaski (Winamac)

67: Putnam (Greencastle) 68: Randolph (Winchester) 69: Ripley (Versailles) 70: Rush (Rushville) 71: St. Joseph (South Bend) 72: Scott (Scottsburg) 73: Shelby (Shelbyville) 74: Spencer (Rockport) 75: Starke (Knox) 76: Steuben (Angola) 77: Sullivan (Sullivan) 78: Switzerland (Vevay) 79: Tippecanoe (Lafayette) 80: Tipton (Tipton) 81: Union (Liberty) 82: Vanderburgh (Evansville) 83: Vermillion (Newport) 84: Vigo (Terre Haute) 85: Wabash (Wabash) 86: Warren (Williamsport) 87: Warrick (Boonville) 88: Washington (Salem) 89: Wayne (Richmond) 90: Wells (Bluffton) 91: White (Monticello) 92: Whitley (Columbia City) 93: Marion (Indianapolis) 94: Lake (Crown Point) 95A: Military/Special 95B-Z: Marion (Indianapolis) 96: Lake (Crown Point) 97-99: Marion (Indianapolis)

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