| # | Institution | Type | Branches | Deposits | Share |
|---|---|---|---|---|---|
| 1 | First Interstate Bank | Bank | 2 | $485.8M | 37.49% |
| 2 | Wyoming Community Bank | Bank | 3 | $220.9M | 17.04% |
| 3 | Grand Altitude Federal Credit Union | Credit union | 3 | $184.5M* | 14.24% |
| 4 | Central Bank and Trust | Bank | 3 | $143.3M | 11.06% |
| 5 | Wells Fargo Bank, National Association | Bank | 1 | $85.1M | 6.57% |
| 6 | Meridian Trust Federal Credit Union | Credit union | 1 | $68.6M* | 5.30% |
| 7 | NBH Bank | Bank | 1 | $60.4M | 4.66% |
| 8 | BMO Bank National Association | Bank | 2 | $47.2M | 3.64% |
* Credit-union deposits are estimated (June total shares spread evenly across branches).
| Year | Deposits | Institutions | Branches | Leader | Top share | HHI |
|---|---|---|---|---|---|---|
| 2025 | $1.30B | 8 | 16 | First Interstate Bank | 37.5% | 2,127 |
| 2024 | $1.23B | 9 | 17 | First Interstate Bank | 34.2% | 1,900 |
| 2023 | $1.25B | 9 | 17 | First Interstate Bank | 34.1% | 1,899 |
| 2022 | $1.25B | 8 | 15 | First Interstate Bank | 35.7% | 2,014 |
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