Banks in Jefferson County, New York
30 active bank branches operated by 8 institutions, per FDIC records.
Active branches
30
Banks present
8
Deposits (2025)
$2.0B
Closings since 2020
10
4 openings
Largest banks by deposits in Jefferson County (2025)
| Bank | Deposits | Share | Branches |
|---|---|---|---|
| Watertown Savings Bank | $760M | 37.2% | 10 |
| Community Bank | $569M | 27.8% | 6 |
| Carthage Savings and Loan | $239M | 11.7% | 3 |
| KeyBank | $236M | 11.5% | 3 |
| WSB Municipal Bank | $105M | 5.1% | 1 |
| Gouverneur Savings and Loan Association | $96M | 4.7% | 3 |
| GS&L Municipal Bank | $23M | 1.1% | 3 |
| The Upstate National Bank | $17M | 0.8% | 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.