Branch Network
Bank of Sun Prairie Locations & Branches Sun Prairie, Wisconsin
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Bank of Sun Prairie operates 8 branches from its headquarters in Sun Prairie, WI, .
Bank of Sun Prairie branch network
All 8 branches are in WISCONSIN, across 6 cities. Sun Prairie, WI has the most of its branches, 3. Its largest office by deposits is its main office in Sun Prairie, WI, with $423.3M (58.8% of its branch deposits). On June 30, 2025 it had 5 branches, 3 fewer than in 2026.
Bank of Sun Prairie at a glance
Its CET1 capital ratio was 13.27% at Q2 2026, comfortably above the 7% level required once the capital conservation buffer is included.
- Total assets, Q2 2026
- $841.2M
- CET1 ratio, Q2 2026
- 13.27%
- Deposit insurance
- FDIC
- Regulator
- FDIC
- Latest call report
- Q2 2026, FFIEC 051
- Established
- 1903
Full financial profile · Is Bank of Sun Prairie safe? · Bank of Sun Prairie call report · Routing number
Deposit market share
Share of all FDIC-insured deposits held in each area, from the June 30, 2026 Summary of Deposits. Rank 1 is the largest holder. Shares are by bank charter, not by holding company.
| Area | Rank | Deposit share | Deposits |
|---|---|---|---|
| City: Sun Prairie, WI (3 branches) | 2 of 10 | 30.1% | $559.2M |
| State: WI (8 branches) | 43 of 185 | 0.3% | $719.5M |
Ranked by total assets among banks headquartered in the state: Largest banks in Wisconsin.
Share by county and metro area
Bank of Sun Prairie's share of FDIC-insured deposits in the counties and metro areas where it has branches, from the June 30, 2026 Summary of Deposits. Up to the ten largest of each are shown, by the bank's deposits. Rank 1 is the largest holder. Banks only: credit unions are not in the Summary of Deposits.
Counties
| County | Rank | Deposit share | Deposits | County total |
|---|---|---|---|---|
| Dane, WI (4 branches) | 14 of 33 | 2.3% | $606.3M | $26.10B |
| Marathon, WI (1 branch) | 12 of 17 | 1.0% | $51.6M | $5.35B |
| Shawano, WI (2 branches) | 7 of 8 | 5.2% | $33.1M | $640.5M |
| Langlade, WI (1 branch) | 3 of 5 | 17.3% | $28.5M | $164.7M |
Metro areas
| Metro area | Rank | Deposit share | Deposits | Metro total |
|---|---|---|---|---|
| Madison, WI (4 branches) | 16 of 41 | 2.0% | $606.3M | $30.15B |
| Wausau-Weston, WI (1 branch) | 13 of 18 | 0.9% | $51.6M | $5.93B |
| Shawano, WI (2 branches) | 8 of 9 | 4.4% | $33.1M | $758.9M |
| Branch | Location | ZIP | Deposits |
|---|---|---|---|
| Bank of Sun Prairie (main office) | Sun Prairie, WI | 53590 | $423.3M |
| Grand Avenue Office Branch | Sun Prairie, WI | 53590 | $135.9M |
| Hatley Branch | Hatley, WI | 54440 | $51.6M |
| Cottage Grove Branch | Cottage Grove, WI | 53527 | $47.0M |
| Antigo Branch | Antigo, WI | 54409 | $28.5M |
| Wittenberg Branch | Wittenberg, WI | 54499 | $16.8M |
| Banner Banks Branch | Birnamwood, WI | 54414 | $16.3M |
| Sun Prairie West High School Branch | Sun Prairie, WI | 53590 | $49K |
Source: FDIC Summary of Deposits, June 30, 2026. How the survey works.
Regulator records: FDIC BankFind (cert 13565) · FFIEC NIC profile (RSSD 124344)