Branch Network
NSB Bank Locations & Branches Mason City, Iowa
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NSB Bank operates 6 branches from its headquarters in Mason City, IA, .
NSB Bank branch network
All 6 branches are in IOWA, across 5 cities. Mason City, IA has the most of its branches, 2. Its largest office by deposits is the Northwood Branch office in Northwood, IA, with $131.6M (32.8% of its branch deposits). It had the same number of branches on June 30, 2025.
NSB Bank at a glance
Its CET1 capital ratio was 10.94% at Q2 2026, above regulatory requirements.
- Total assets, Q2 2026
- $460.8M
- CET1 ratio, Q2 2026
- 10.94%
- Deposit insurance
- FDIC
- Regulator
- FDIC
- Latest call report
- Q2 2026, FFIEC 051
- Established
- 1933
Full financial profile · Is NSB Bank safe? · NSB 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: Mason City, IA (2 branches) | 5 of 6 | 8.2% | $105.2M |
| State: IA (6 branches) | 69 of 261 | 0.3% | $400.6M |
Ranked by total assets among banks headquartered in the state: Largest banks in Iowa.
Share by county and metro area
NSB 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 |
|---|---|---|---|---|
| Worth, IA (1 branch) | 1 of 3 | 59.1% | $131.6M | $222.5M |
| Cerro Gordo, IA (2 branches) | 5 of 9 | 5.7% | $105.2M | $1.85B |
| Winnebago, IA (2 branches) | 3 of 4 | 15.7% | $101.4M | $644.6M |
| Kossuth, IA (1 branch) | 7 of 9 | 6.6% | $62.4M | $951.9M |
Metro areas
| Metro area | Rank | Deposit share | Deposits | Metro total |
|---|---|---|---|---|
| Mason City, IA (3 branches) | 3 of 9 | 11.4% | $236.8M | $2.07B |
| Branch | Location | ZIP | Deposits |
|---|---|---|---|
| Northwood Branch | Northwood, IA | 50459 | $131.6M |
| NSB Bank (main office) | Mason City, IA | 50401 | $82.9M |
| Forest City Branch | Forest City, IA | 50436 | $75.8M |
| Titonka Branch | Titonka, IA | 50480 | $62.4M |
| Thompson Branch | Thompson, IA | 50478 | $25.7M |
| Regency Branch | Mason City, IA | 50401 | $22.3M |
Source: FDIC Summary of Deposits, June 30, 2026. How the survey works.
Regulator records: FDIC BankFind (cert 8094) · FFIEC NIC profile (RSSD 253646)