Bank · FDIC insured
Bank of Sun Prairie
A $841.2M bank headquartered in Sun Prairie, WI, with 7 branches in Wisconsin.
Deposits are federally insured by the FDIC up to $250,000 per depositor.
About Bank of Sun Prairie
Founded in 1897 and state-chartered in 1903, Bank of Sun Prairie is a locally owned, independent bank in Wisconsin.
The bank acquired Farmers & Merchants Bank in 1929 and merged with Banner Banks in May 2026.
- Headquarters
- 228 E Main St, Sun Prairie, WI 53590
- FDIC certificate
- 13565 ↗
Branches
7 branches in Wisconsin
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Wisconsin
7 branches
Madison area · 3
- Bank of Sun PrairieMain office228 E Main St, Sun Prairie, WI 53590Directions
- Cottage Grove Branch419 W Cottage Grove Rd, Cottage Grove, WI 53527Directions
- Grand Avenue Office Branch695 S Grand Ave, Sun Prairie, WI 53590Directions
Shawano area · 2
- Banner Banks Branch416 Main St, Birnamwood, WI 54414Directions
- Wittenberg Branch201 E Westgor Ave, Wittenberg, WI 54499Directions
Antigo area · 1
- Antigo Branch100 S Superior St, Antigo, WI 54409Directions
Wausau area · 1
- Hatley Branch410 State Road, Hatley, WI 54440Directions
Walk-in offices from the FDIC directory as of September 4, 2026. Directions open Google Maps. A nearby branch doesn’t mean you can join or open an account.
Financial details
| Measure | This bank | Peers’ middle | Strongest quarter |
|---|---|---|---|
| CapitalLeverage ratio | 9.99% | 10.98% | 13.00% or more |
| Troubled loansNoncurrent | 0.07% | 0.42% | 0.09% or less |
| ProfitabilityReturn on assets | 0.63% | 1.24% | 1.68% or more |
| LendingLoans per $100 deposited | $84 | $81 | — |
- CapitalLeverage ratio9.99%Peers’ middle 10.98% · Top 25% 13.00%+
- Troubled loansNoncurrent0.07%Peers’ middle 0.42% · Top 25% ≤0.09%
- ProfitabilityReturn on assets0.63%Peers’ middle 1.24% · Top 25% 1.68%+
- LendingLoans per $100 deposited$84Peers’ middle $81
Compared with the 2,650 banks with $100 million to $1 billion in assets. The strongest quarter is what the best 25% of them reach: more capital and profit, fewer troubled loans. Lending has no better end.Troubled loans are noncurrent: 90 or more days late, or no longer earning interest.
Regulators’ own ratings of Bank of Sun Prairie are confidential. These figures are what it reports to the FDIC each quarter, set beside its peers; they aren’t a rating.