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First Seacoast Bank Locations & Branches Dover, New Hampshire
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First Seacoast Bank operates 5 branches from its headquarters in Dover, NH, .
First Seacoast Bank branch network
All 5 branches are in NEW HAMPSHIRE, across 5 cities. Its largest office by deposits is its main office in Dover, NH, with $276.9M (58.6% of its branch deposits). It had the same number of branches on June 30, 2025.
First Seacoast Bank at a glance
Its CET1 capital ratio was 14.90% at Q2 2026, comfortably above the 7% level required once the capital conservation buffer is included.
- Total assets, Q2 2026
- $576.3M
- CET1 ratio, Q2 2026
- 14.90%
- Deposit insurance
- FDIC
- Regulator
- OCC
- Latest call report
- Q2 2026, FFIEC 051
- Established
- 1890
Full financial profile · Is First Seacoast Bank safe? · First Seacoast Bank 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: Dover, NH (1 branch) | 2 of 11 | 19.9% | $276.9M |
| State: NH (5 branches) | 19 of 44 | 1.0% | $472.1M |
Ranked by total assets among banks headquartered in the state: Largest banks in New Hampshire.
Share by county and metro area
First Seacoast Bank'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 |
|---|---|---|---|---|
| Strafford, NH (4 branches) | 3 of 12 | 16.5% | $420.5M | $2.55B |
| Rockingham, NH (1 branch) | 20 of 25 | 0.4% | $51.7M | $12.65B |
Metro areas
| Metro area | Rank | Deposit share | Deposits | Metro total |
|---|---|---|---|---|
| Boston-Cambridge-Newton, MA-NH (5 branches) | 52 of 99 | <0.1% | $472.1M | $580.15B |
| Branch | Location | ZIP | Deposits |
|---|---|---|---|
| First Seacoast Bank (main office) | Dover, NH | 03820 | $276.9M |
| Rt 125 Barrington Branch | Barrington, NH | 03825 | $58.6M |
| 1 Market Square Branch | Portsmouth, NH | 03801 | $51.7M |
| Durham Shopping Plaza Branch | Durham, NH | 03824 | $45.4M |
| 17 Wakefield Street Branch | Rochester, NH | 03867 | $39.6M |
Source: FDIC Summary of Deposits, June 30, 2026. How the survey works.
Regulator records: FDIC BankFind (cert 29744) · FFIEC NIC profile (RSSD 119872)