Sýslur í Montana eru 56 talsins.

Nafn Höfuðborg Mannfjöldi (2010) Flatarmál (km2)
Beaverhead Dillon 9.345 14.356
Big Horn Hardin 13.282 12.937
Blaine Chinook 6.619 10.945
Broadwater Townsend 5.667 3.087
Carbon Red Lodge 10.399 5.304
Carter Ekalaka 1.169 8.651
Cascade Great Falls 81.366 6.988
Chouteau Fort Benton 5.894 10.290
Custer Miles City 12.092 9.798
Daniels Scobey 1.793 3.693
Dawson Glendive 9.518 6.146
Deer Lodge Anaconda 9.150 1.909
Fallon Baker 3.108 4.196
Fergus Lewistown 11.442 11.238
Flathead Kalispell 103.806 13.206
Gallatin Bozeman 114.434 6.493
Garfield Jordan 1.309 12.090
Glacier Cut Bank 13.696 7.757
Golden Valley Ryegate 852 3.043
Granite Philipsburg 3.209 4.475
Hill Havre 16.596 7.501
Jefferson Boulder 11.558 4.292
Judith Basin Stanford 1.991 4.843
Lake Polson 29.099 3.869
Lewis and Clark Helena 69.432 8.964
Liberty Chester 2.359 3.704
Lincoln Libby 19.125 9.358
McCone Circle 1.694 6.845
Madison Virginia City 7.820 9.290
Meagher White Sulphur Springs 1.853 6.195
Mineral Superior 4.316 3.160
Missoula Missoula 119.600 6.729
Musselshell Roundup 4.651 4.836
Park Livingston 16.606 6.879
Petroleum Winnett 513 4.284
Phillips Malta 4.074 13.313
Pondera Conrad 5.972 4.209
Powder River Broadus 1.716 8.539
Powell Deer Lodge 6.968 6.024
Prairie Terry 1.087 4.499
Ravalli Hamilton 43.806 6.200
Richland Sidney 10.913 5.398
Roosevelt Wolf Point 11.059 6.102
Rosebud Forsyth 9.063 12.981
Sanders Thompson Falls 11.844 7.154
Sheridan Plentywood 3.424 4.343
Silver Bow Butte 34.915 1.860
Stillwater Columbus 9.534 4.649
Sweet Grass Big Timber 3.710 4.804
Teton Choteau 6.162 5.887
Toole Shelby 4.853 4.949
Treasure Hysham 679 2.536
Valley Glasgow 7.437 12.745
Wheatland Harlowton 2.236 3.686
Wibaux Wibaux 1.034 2.302
Yellowstone Billings 161.300 6.825