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 | $555,337 | BK |
| American Bank, National Association | Le Mars, IA | 01-01-1887 | $550,204 | BK |
| South Ottumwa Savings Bank | Ottumwa, IA | 01-01-1903 | $547,396 | BK |
| Iowa Trust & Savings Bank | Emmetsburg, IA | 07-01-1929 | $545,653 | BK |
| American Bank and Trust Company, National Association | Davenport, IA | 01-05-1999 | $535,718 | BK |
| ASCENTRA | Bettendorf, IA | 01-01-1950 | $534,115 | CU |
| Citizens State Bank | Monticello, IA | 03-11-1931 | $521,769 | BK |
| Peoples Savings Bank | Indianola, IA | 11-20-1998 | $506,232 | BK |
| South Story Bank & Trust | Slater, IA | 09-01-1954 | $496,471 | BK |
| Central State Bank | State Center, IA | 01-01-1902 | $494,333 | BK |
| Connection Bank | Fort Madison, IA | 07-01-1854 | $482,867 | BK |
| Iowa State Bank | Algona, IA | 01-01-1928 | $471,428 | BK |
| Central State Bank | Coralville, IA | 11-12-1931 | $468,999 | BK |
| Grinnell State Bank | Grinnell, IA | 10-25-1925 | $467,629 | BK |
| Peoples Bank | Clive, IA | 03-17-1917 | $466,952 | BK |