| # | Institution | Type | Branches | Deposits | Share |
|---|---|---|---|---|---|
| 1 | First National Bank of Gillette | Bank | 3 | $570.0M | 34.44% |
| 2 | First Interstate Bank | Bank | 2 | $356.2M | 21.52% |
| 3 | Wells Fargo Bank, National Association | Bank | 1 | $138.7M | 8.38% |
| 4 | Campco Federal Credit Union | Credit union | 2 | $132.0M* | 7.98% |
| 5 | Security State Bank | Bank | 1 | $107.3M | 6.48% |
| 6 | First Northern Bank of Wyoming | Bank | 1 | $100.5M | 6.07% |
| 7 | Pinnacle Bank - Wyoming | Bank | 1 | $85.4M | 5.16% |
| 8 | Buffalo Federal Bank | Bank | 1 | $56.6M | 3.42% |
| 9 | Highmark Federal Credit Union | Credit union | 1 | $47.0M* | 2.84% |
| 10 | U.S. Bank National Association | Bank | 1 | $39.3M | 2.38% |
| 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 |
|---|---|---|---|---|---|---|
| 2026 | $1.66B | 11 | 15 | First National Bank of Gillette | 34.4% | 1,916 |
| 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% | 1,937 |
| 2022 | $1.64B | 11 | 15 | First National Bank of Gillette | 34.9% | 2,032 |
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.