Banks in Jefferson County, Wisconsin
23 active bank branches operated by 11 institutions, per FDIC records.
Active branches
23
Banks present
11
Deposits (2026)
$2.3B
Closings since 2020
3
1 openings
Largest banks by deposits in Jefferson County (2026)
| Bank | Deposits | Share | Branches |
|---|---|---|---|
| Ixonia Bank | $534M | 22.8% | 3 |
| Bank of Lake Mills | $432M | 18.4% | 2 |
| PremierBank | $347M | 14.8% | 5 |
| Bank Cmg | $345M | 14.7% | 2 |
| Associated Bank | $183M | 7.8% | 2 |
| BMO Bank | $130M | 5.5% | 1 |
| Badger Bank | $113M | 4.8% | 3 |
| Farmers & Merchants State Bank | $106M | 4.5% | 2 |
| Bank First | $61M | 2.6% | 1 |
| Johnson Bank | $54M | 2.3% | 1 |
Deposit location reflects the office to which deposits are reported and may not represent the residence of depositors.
Cities and towns
Transcribed from FDIC BankFind Suite active-location records and the annual Summary of Deposits. County assignment follows the FDIC branch record.