Branch Network
American State Bank Locations & Branches Sioux Center, Iowa
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American State Bank operates 11 branches from its headquarters in Sioux Center, IA, .
American State Bank branch network
Its 11 branches span 2 states and 8 cities. The most are in IOWA (10) and SOUTH DAKOTA (1). IOWA holds 95.5% of its branch deposits. Sioux Center, IA has the most of its branches, 4. Its largest office by deposits is its main office in Sioux Center, IA, with $786.2M (64.5% of its branch deposits). It had the same number of branches on June 30, 2025.
American State Bank at a glance
Its CET1 capital ratio was 11.78% at Q2 2026, above regulatory requirements.
- Total assets, Q2 2026
- $1.45B
- CET1 ratio, Q2 2026
- 11.78%
- Deposit insurance
- FDIC
- Regulator
- FDIC
- Latest call report
- Q2 2026, FFIEC 051
- Established
- 1913
Full financial profile · Is American State Bank safe? · American State 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: Sioux Center, IA (4 branches) | 1 of 4 | 64.8% | $795.3M |
| State: IA (10 branches) | 24 of 261 | 0.9% | $1.16B |
Ranked by total assets among banks headquartered in the state: Largest banks in Iowa.
Share by county and metro area
American State 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 |
|---|---|---|---|---|
| Sioux, IA (9 branches) | 1 of 9 | 37.9% | $1.11B | $2.93B |
| Lincoln, SD (1 branch) | 19 of 26 | <0.1% | $55.3M | $647.52B |
| Lyon, IA (1 branch) | 6 of 6 | 6.9% | $52.7M | $758.6M |
Metro areas
| Metro area | Rank | Deposit share | Deposits | Metro total |
|---|---|---|---|---|
| Sioux Falls, SD (1 branch) | 32 of 39 | <0.1% | $55.3M | $1.13T |
| Branch | Location | ZIP | Deposits |
|---|---|---|---|
| American State Bank (main office) | Sioux Center, IA | 51250 | $786.2M |
| Hull Branch | Hull, IA | 51239 | $74.2M |
| Orange City Branch | Orange City, IA | 51041 | $67.2M |
| Hospers Branch | Hospers, IA | 51238 | $61.7M |
| Alton Branch | Alton, IA | 51003 | $60.1M |
| Cliff Ave Branch | Sioux Falls, SD | 57108 | $55.3M |
| Alvord Branch | Alvord, IA | 51230 | $52.7M |
| Granville Branch | Granville, IA | 51022 | $51.7M |
| Sioux Center South Branch | Sioux Center, IA | 51250 | $9.1M |
| Sioux Center Branch | Sioux Center, IA | 51250 | $0 |
| Sioux Center Trust Department Building Branch | Sioux Center, IA | 51250 | $0 |
Source: FDIC Summary of Deposits, June 30, 2026. How the survey works.
Regulator records: FDIC BankFind (cert 228) · FFIEC NIC profile (RSSD 735441)