| # | Institution | Type | Metro | Assets | Efficiency ratio |
|---|---|---|---|---|---|
| 1 | Pioneer State Bank Deer Lodge, MT | Bank | — | $133.5M | 193.32% |
| 2 | Tricounty Federal Credit Union Harlowton, MT | Credit Union | — | $1.9M | 115.82% |
| 3 | Davidson Trust Co. Great Falls, MT | Bank | Great Falls, MT | $13.2M | 95.49% |
| 4 | Butte Community Federal Credit Union Butte, MT | Credit Union | — | $37.4M | 94.70% |
| 5 | Fort Peck Community Federal Credit Union Fort Peck, MT | Credit Union | — | $14.4M | 94.66% |
| 6 | Daniels-Sheridan Federal Credit Union Scobey, MT | Credit Union | — | $92.4M | 94.17% |
| 7 | M D U Employees Federal Credit Union Glendive, MT | Credit Union | — | $4.1M | 87.80% |
| 8 | Rocky Mountain Credit Union Helena, MT |
| Credit Union |
| — |
| $424.3M |
| 86.73% |
| 9 | The Morning Star Federal Credit Union Lame Deer, MT | Credit Union | — | $2.5M | 86.61% |
| 10 | Mile High Federal Credit Union Butte, MT | Credit Union | — | $29.2M | 85.81% |
| 11 | Mountain West Federal Credit Union Butte, MT | Credit Union | — | $24.0M | 84.49% |
| 12 | Whitefish Credit Union Association Credit Union Whitefish, MT | Credit Union | — | $2.06B | 83.34% |
| 13 | Sky Federal Credit Union Livingston, MT | Credit Union | — | $190.4M | 82.74% |
| 14 | Badlands Federal Credit Union Glendive, MT | Credit Union | — | $38.9M | 81.74% |
| 15 | Community 1St Federal Credit Union Miles City, MT | Credit Union | — | $44.1M | 81.41% |
| 16 | Bitterroot Community Federal Credit Union Darby, MT | Credit Union | — | $18.6M | 80.72% |
| 17 | Altana Federal Credit Union Billings, MT | Credit Union | — | $660.2M | 80.19% |
| 18 | Northern Montana Hospital Federal Credit Union Havre, MT | Credit Union | — | $1.0M | 78.86% |
| 19 | Bank of Bozeman Bozeman, MT | Bank | Bozeman, MT | $108.4M | 77.59% |
| 20 | Park Side Financial Credit Union Whitefish, MT | Credit Union | — | $389.1M | 74.63% |
| 21 | Grasslands Federal Credit Union Circle, MT | Credit Union | — | $139.5M | 74.16% |
| 22 | Opportunity Bank of Montana Helena, MT | Bank | Helena, MT | $2.12B | 73.97% |
| 23 | Valley Bank of Ronan Ronan, MT | Bank | — | $218.1M | 73.23% |
| 24 | Farmers State Bank Victor, MT | Bank | — | $790.3M | 72.94% |
| 25 | Clearwater Federal Credit Union Missoula, MT | Credit Union | — | $1.15B | 72.31% |
| 26 | Seg Federal Credit Union Laurel, MT | Credit Union | — | $25.5M | 71.15% |
| 27 | Southwest Montana Community Federal Credit Union Anaconda, MT | Credit Union | — | $202.6M | 70.78% |
| 28 | Madison Valley Bank Ennis, MT | Bank | — | $263.7M | 70.68% |
| 29 | Glendive Bn Federal Credit Union Glendive, MT | Credit Union | — | $28.5M | 69.70% |
| 30 | Wolf Point Federal Credit Union Wolf Point, MT | Credit Union | — | $23.0M | 68.78% |
| 31 | First Montana Bank, Inc. Missoula, MT | Bank | Missoula, MT | $530.3M | 66.30% |
| 32 | American Bank Bozeman, MT | Bank | Bozeman, MT | $630.4M | 66.05% |
| 33 | Richland Federal Credit Union Sidney, MT | Credit Union | — | $117.7M | 65.61% |
| 34 | Three Rivers Bank of Montana Kalispell, MT | Bank | Kalispell, MT | $293.1M | 65.07% |
| 35 | St. Pats Employees Federal Credit Union Missoula, MT | Credit Union | — | $5.5M | 64.60% |
| 36 | The Bank of Baker Baker, MT | Bank | — | $160.9M | 63.36% |
| 37 | Manhattan Bank Manhattan, MT | Bank | Bozeman, MT | $287.1M | 63.09% |
| 38 | Rimrock Credit Union Billings, MT | Credit Union | — | $63.5M | 62.80% |
| 39 | Bank of The Rockies Helena, MT | Bank | Helena, MT | $277.4M | 62.11% |
| 40 | Bank of Bridger, National Association Bridger, MT | Bank | Billings, MT | $802.7M | 61.03% |
| 41 | Ravalli County Federal Credit Union Hamilton, MT | Credit Union | — | $89.1M | 59.82% |
| 42 | Fergus Federal Credit Union Lewistown, MT | Credit Union | — | $118.9M | 59.51% |
| 43 | Glacier Bank Kalispell, MT | Bank | Kalispell, MT | $31.58B | 58.96% |
| 44 | First Interstate Bank Billings, MT | Bank | Billings, MT | $25.79B | 58.39% |
| 45 | Ascent Bank Helena, MT | Bank | Helena, MT | $104.1M | 57.58% |
| 46 | Garfield County Bank Jordan, MT | Bank | — | $108.0M | 56.67% |
| 47 | Freedom Bank Columbia Falls, MT | Bank | Kalispell, MT | $157.3M | 56.38% |
| 48 | The First State Bank of Shelby Shelby, MT | Bank | — | $175.6M | 56.09% |
| 49 | Froid Federal Credit Union Froid, MT | Credit Union | — | $1.2M | 54.23% |
| 50 | The First State Bank of Malta Malta, MT | Bank | — | $189.7M | 53.04% |