Union Association
| Class D | 1911-1914 |
Teams (in alphabetical order)
Boise Irrigators, 1911, 1914
Butte Miners, 1911-1914
Great Falls Electrics, 1911-1913
Helena Senators, 1911-1914
Missoula (unnamed), 1911-1913
Murray Infants, 1914
Ogden Canners, 1912-1914
Salt Lake City Skyscrapers, 1911-1914