FDIC-insured bank
American State Bank — Sioux Center, IA
Bank headquartered in Sioux Center, Iowa, part of AMBANK CO INC.
Source: FDIC BankFind Suite, data as of June 30, 2026, fetched September 5, 2026
Headquarters and contact
| Address | 525 N Main Ave Sioux Center, IA 51250 |
| County | Sioux |
| Website | www.ambankiowa.com |
| Phone | not published in FDIC data, see the bank's website |
FDIC record
| FDIC Certificate | 228 |
| Federal Reserve RSSD ID | 735441 |
| Status | Active |
| Charter class | NM (STATE) |
| Holding company | AMBANK CO INC |
| Domestic offices | 11 |
| Financials as of | June 30, 2026 |
How to find your American State Bank routing number
FDIC does not publish ABA routing numbers, and many banks use different routing numbers by state or by account type. The reliable places to find yours: the bottom left of a check from this bank, the "account details" screen in its online banking, or its official website at www.ambankiowa.com.
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Offices nearest to headquarters
| American State Bank main office Sioux Center, IA |
525 N Main Ave, 51250 |
| Sioux Center Branch Sioux Center, IA |
18 6th St Nw, 51250 |
| Sioux Center Trust Department Building Branch Sioux Center, IA |
675 N Main Ave, 51250 |
| Sioux Center South Branch Sioux Center, IA |
16 20th Street Se, 51250 |
| Hull Branch Hull, IA |
624 Main St, 51239 |
| Orange City Branch Orange City, IA |
901 8th St Se, 51041 |
| Alton Branch Alton, IA |
208 10th St, 51003 |
| Hospers Branch Hospers, IA |
100 2nd Ave N, 51238 |
| Alvord Branch Alvord, IA |
212 N Main St, 51230 |
| Granville Branch Granville, IA |
741 Broad St, 51022 |
| Cliff Ave Branch Sioux Falls, SD |
1201 E Cliff Pl, 57108 |
Where American State Bank has offices
Cities with the most American State Bank offices
Largest banks headquartered elsewhere in Iowa
| Principal Bank Des Moines | $9.84 billion |
| Bankers Trust Company Des Moines | $7.83 billion |
| Hills Bank and Trust Company Hills | $4.79 billion |
| West Bank West Des Moines | $4.03 billion |
| Northwest Bank Spencer | $3 billion |
| Cedar Rapids Bank and Trust Company Cedar Rapids | $2.90 billion |
| Quad City Bank and Trust Company Bettendorf | $2.77 billion |
| Fidelity Bank & Trust Dubuque | $2.60 billion |
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