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These codes first appeared in the mid-30s and remain in use today.

County Code #: County (County Seat)

1: Silver Bow (Butte) 2: Cascade (Great Falls) 3: Yellowstone (Billings) 4: Missoula (Missoula) 5: Lewis & Clark (Helena) 6: Gallatin (Bozeman) 7: Flathead (Kalispell) 8: Fergus (Lewistown) 9: Powder River (Broadus) 10: Carbon (Red Lodge) 11: Phillips (Malta) 12: Hill (Havre) 13: Ravalli (Hamilton) 14: Custer (Miles City) 15: Lake (Polson) 16: Dawson (Glendive) 17: Roosevelt (Wolf Point) 18: Beaverhead (Dillon) 19: Chouteau (Fort Benton)

20: Valley (Glasgow) 21: Toole (Shelby) 22: Big Horn (Hardin) 23: Musselshell (Roundup) 24: Blaine (Chinook) 25: Madison (Virginia City) 26: Pondera (Conrad) 27: Richland (Sidney) 28: Powell (Deer Lodge) 29: Rosebud (Forsyth) 30: Deer Lodge (Anaoonda) 31: Teton (Choteau) 32: Stillwater (Columbus) 33: Treasure (Hysham) 34: Sheridan (Plentywood) 35: Sanders (Thompson Falls) 36: Judith Basin (Stanford) 37: Daniels (Scobey) 38: Glacier (Cut Bank)

39: Fallon (Baker) 40: Sweet Grass (Big Timber) 41: McCone (Circle) 42: Carter (Ekalaka) 43: Broadwater (Townsend) 44: Wheatland (Harlowtown) 45: Prairie (Terry) 46: Granite (Philipsburg) 47: Meagher (White Sulphur Springs) 48: Liberty (Chester) 49: Park (Livingston) 50: Garfield (Jordan) 51: Jefferson (Boulder) 52: Wibaux (Wibaux) 53: Golden Valley (Ryegate) 54: Mineral (Superior) 55: Petroleum (Winnett) 56: Lincoln (Libby)

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