Banks in Plymouth County, Iowa
15 active bank branches operated by 8 institutions, per FDIC records.
Active branches
15
Banks present
8
Deposits (2026)
$1.4B
Closings since 2020
1
0 openings
Largest banks by deposits in Plymouth County (2026)
| Bank | Deposits | Share | Branches |
|---|---|---|---|
| American Bank | $445M | 31.2% | 2 |
| Primebank | $384M | 27% | 1 |
| Iowa State Bank | $185M | 12.9% | 5 |
| Northwest Bank | $104M | 7.3% | 1 |
| Midstates Bank | $98M | 6.9% | 2 |
| United Bank of Iowa | $83M | 5.8% | 1 |
| Peoples Bank | $80M | 5.6% | 2 |
| The Security National Bank of Sioux City, Iowa | $45M | 3.2% | 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.