Every FDIC-insured bank branch in Brown County, South Dakota as of June 30, 2025. County land area: 1,713 square miles, 0.9 branches per 100 sq mi.
| Institution | Branches | Deposits |
|---|---|---|
| Dacotah Bank | 3 | $883.7M |
| First Interstate Bank | 2 | $176.7M |
| BankNorth | 2 | $91.5M |
| American Bank & Trust | 1 | $94.9M |
| Plains Commerce Bank | 1 | $270.8M |
| First Savings Bank | 1 | $15.3M |
| Wells Fargo Bank, National Association | 1 | $218.3M |
| The First National Bank of Frederick | 1 | $25.3M |
| Great Plains Bank | 1 | $48.7M |
| CorTrust Bank National Association | 1 | $35.6M |
| U.S. Bank National Association | 1 | $92.1M |