Or by the first letter of a Bank Name
| Headquarters | Date Established | Assets (1000s) | Type | |
|---|---|---|---|---|
| The Shelby County State Bank | Harlan, IA | 08-02-1909 | $564,723 | BK |
| Central State Bank | State Center, IA | 01-01-1902 | $559,677 | BK |
| First Security Bank and Trust Company | Charles City, IA | 07-14-1903 | $558,082 | BK |
| Iowa Trust & Savings Bank | Emmetsburg, IA | 07-01-1929 | $555,095 | BK |
| South Story Bank & Trust | Slater, IA | 09-01-1954 | $553,414 | BK |
| American Bank, National Association | Le Mars, IA | 01-01-1887 | $540,940 | BK |
| ASCENTRA | Bettendorf, IA | 01-01-1950 | $538,856 | CU |
| Citizens State Bank | Monticello, IA | 03-11-1931 | $538,376 | BK |
| South Ottumwa Savings Bank | Ottumwa, IA | 01-01-1903 | $537,201 | BK |
| American Bank and Trust Company, National Association | Davenport, IA | 01-05-1999 | $520,347 | BK |
| Connection Bank | Fort Madison, IA | 07-01-1854 | $508,944 | BK |
| Grinnell State Bank | Grinnell, IA | 10-25-1925 | $508,261 | BK |
| Iowa State Bank | Algona, IA | 01-01-1928 | $482,347 | BK |
| Central State Bank | Coralville, IA | 11-12-1931 | $477,336 | BK |
| NSB Bank | Mason City, IA | 01-01-1933 | $474,652 | BK |