| # | Institution | Type | Branches | Deposits | Share |
|---|---|---|---|---|---|
| 1 | First National Bank of Gillette | Bank | 3 | $521.0M | 32.88% |
| 2 | First Interstate Bank | Bank | 2 | $354.5M | 22.37% |
| 3 | Wells Fargo Bank, National Association | Bank | 1 | $138.6M | 8.75% |
| 4 | Campco Federal Credit Union | Credit union | 2 | $127.1M* | 8.02% |
| 5 | Security State Bank | Bank | 1 | $99.7M | 6.29% |
| 6 | Pinnacle Bank - Wyoming | Bank | 1 | $99.6M | 6.28% |
| 7 | First Northern Bank of Wyoming | Bank | 1 | $89.8M | 5.66% |
| 8 | Buffalo Federal Bank | Bank | 1 | $54.0M | 3.41% |
| 9 | Highmark Federal Credit Union | Credit union | 1 | $46.8M* | 2.96% |
| 10 | U.S. Bank National Association | Bank | 1 | $34.9M | 2.20% |
| 1 more institutions, year-over-year share and branch changes with Pro →$29/mo, cancel any time. | |||||
* Credit-union deposits are estimated (June total shares spread evenly across branches).
| Year | Deposits | Institutions | Branches | Leader | Top share | HHI |
|---|---|---|---|---|---|---|
| 2025 | $1.58B | 11 | 15 | First National Bank of Gillette | 32.9% | 1,860 |
| 2024 | $1.58B | 11 | 15 | First National Bank of Gillette | 32.6% | 1,892 |
| 2023 | $1.58B | 11 | 15 | First National Bank of Gillette | 34.3% | 1,936 |
| 2022 | $1.64B | 11 | 15 | First National Bank of Gillette | 34.8% | 2,030 |
Every institution above links to its profile — ratios, peer medians and this quarter’s change signals. Pro adds the full table, share movement and CSV export.