| # | Institution | Type | Branches | Deposits | Share |
|---|---|---|---|---|---|
| 1 | Dacotah Bank | Bank | 1 | $254.9M | 52.14% |
| 2 | First Savings Bank | Bank | 1 | $92.0M | 18.81% |
| 3 | Minnwest Bank | Bank | 2 | $67.1M | 13.72% |
| 4 | First Interstate Bank | Bank | 1 | $28.8M | 5.89% |
| 5 | Wells Fargo Bank, National Association | Bank | 1 | $27.2M | 5.57% |
| 6 | Coteau Valley Federal Credit Union | Credit union | 2 | $17.4M* | 3.55% |
| 7 | Sisseton-Wahpeton Federal Credit Union | Credit union | 2 | $1.5M* | 0.31% |
* Credit-union deposits are estimated (June total shares spread evenly across branches).
| Year | Deposits | Institutions | Branches | Leader | Top share | HHI |
|---|---|---|---|---|---|---|
| 2026 | $488.8M | 7 | 10 | Dacotah Bank | 52.1% | 3,339 |
| 2025 | $476.7M | 7 | 9 | Dacotah Bank | 53.8% | 3,453 |
| 2024 | $496.1M | 7 | 9 | Dacotah Bank | 55.7% | 3,607 |
| 2023 | $470.8M | 7 | 9 | Dacotah Bank | 53.1% | 3,383 |
| 2022 | $481.2M | 7 | 8 | Dacotah Bank | 53.9% | 3,453 |
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