Banks in Plymouth County, Iowa
15 active bank branches operated by 8 institutions, per FDIC records.
Active branches
15
Banks present
8
Deposits (2025)
$1.4B
Closings since 2020
1
0 openings
Largest banks by deposits in Plymouth County (2025)
| Bank | Deposits | Share | Branches |
|---|---|---|---|
| American Bank | $432M | 30.9% | 2 |
| Primebank | $370M | 26.5% | 1 |
| Iowa State Bank | $212M | 15.2% | 5 |
| Northwest Bank | $91M | 6.5% | 1 |
| Midstates Bank | $88M | 6.3% | 2 |
| Peoples Bank | $79M | 5.7% | 2 |
| United Bank of Iowa | $77M | 5.5% | 1 |
| The Security National Bank of Sioux City, Iowa | $49M | 3.5% | 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.