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The Security National Bank of Sioux City, Iowa Locations & Branches Sioux City, Iowa
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The Security National Bank of Sioux City, Iowa operates 10 branches from its headquarters in Sioux City, IA, . Its main office is at 601 Pierce St, Sioux City, IA 51101.
The Security National Bank of Sioux City, Iowa branch network
All 10 branches are in IOWA, across 7 cities. Sioux City, IA has the most of its branches, 4. Its largest office by deposits is its main office in Sioux City, IA, with $555.1M (42.3% of its branch deposits). It had the same number of branches on June 30, 2025.
The Security National Bank of Sioux City, Iowa at a glance
It reports no CET1 ratio; its Tier 1 leverage ratio was 12.79% at Q2 2026, above the 9% community bank leverage ratio requirement for being considered well capitalized.
- Total assets, Q2 2026
- $1.69B
- Tier 1 leverage ratio, Q2 2026
- 12.79%
- Deposit insurance
- FDIC
- Regulator
- OCC
- Latest call report
- Q2 2026, FFIEC 051
- Established
- 1884
Full financial profile · Is The Security National Bank of Sioux City, Iowa safe? · The Security National Bank of Sioux City, Iowa Q3 2026 call report, filed October 27, 2026 (preliminary) · 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: Sioux City, IA (4 branches) | 1 of 14 | 28.6% | $847.4M |
| State: IA (10 branches) | 21 of 261 | 1.0% | $1.31B |
Ranked by total assets among banks headquartered in the state: Largest banks in Iowa.
Share by county and metro area
The Security National Bank of Sioux City, Iowa'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 |
|---|---|---|---|---|
| Woodbury, IA (6 branches) | 1 of 20 | 28.3% | $975.1M | $3.45B |
| Sioux, IA (1 branch) | 5 of 9 | 5.3% | $155.5M | $2.93B |
| Monona, IA (1 branch) | 2 of 9 | 18.7% | $75.0M | $401.7M |
| O'brien, IA (1 branch) | 7 of 9 | 5.9% | $60.7M | $1.02B |
| Plymouth, IA (1 branch) | 8 of 8 | 3.2% | $45.4M | $1.43B |
Metro areas
| Metro area | Rank | Deposit share | Deposits | Metro total |
|---|---|---|---|---|
| Sioux City, IA-NE-SD (6 branches) | 1 of 30 | 20.4% | $975.1M | $4.77B |
| Branch | Location | ZIP | Deposits |
|---|---|---|---|
| The Security National Bank of Sioux City, Iowa (main office) | Sioux City, IA | 51101 | $555.1M |
| Morningside Branch | Sioux City, IA | 51106 | $169.8M |
| Northwestern Bank Branch | Orange City, IA | 51041 | $155.5M |
| Moville Branch | Moville, IA | 51039 | $89.7M |
| Northside Branch | Sioux City, IA | 51108 | $87.2M |
| Mapleton Branch | Mapleton, IA | 51034 | $75.0M |
| Sheldon Branch | Sheldon, IA | 51201 | $60.7M |
| Akron Branch | Akron, IA | 51001 | $45.4M |
| Lawton Branch | Lawton, IA | 51030 | $38.0M |
| Westside Branch | Sioux City, IA | 51104 | $35.3M |
Source: FDIC Summary of Deposits, June 30, 2026. How the survey works.
Regulator records: FDIC BankFind (cert 4506) · FFIEC NIC profile (RSSD 418249)