| # | Institution | Type | Metro | Assets | Efficiency ratio |
|---|---|---|---|---|---|
| 1 | Maxwell State Bank Maxwell, IA | Bank | Ames, IA | $31.7M | 188.73% |
| 2 | American Trust and Savings Bank Lowden, IA | Bank | — | $27.8M | 164.63% |
| 3 | GreatAmerica Bank National Association Cedar Rapids, IA | Bank | Cedar Rapids, IA | $450.0M | 133.88% |
| 4 | Unite Credit Union Cedar Falls, IA | Credit Union | — | $23.5M | 116.85% |
| 5 | Twin Cedars Bank Bussey, IA | Bank | Pella, IA | $118.3M | 108.20% |
| 6 | Teamsters Local #238 Credit Union Cedar Rapids, IA | Credit Union | — | $7.7M | 107.38% |
| 7 | First Federal Credit Union Hiawatha, IA | Credit Union | — | $177.4M | 105.98% |
| 8 | WCF Financial Bank Webster City, IA | Bank | — |
| $224.4M |
| 95.25% |
| 9 | St. Athanasius Credit Union Jesup, IA | Credit Union | — | $499K | 95.24% |
| 10 | Peoples Credit Union Webster City, IA | Credit Union | — | $93.6M | 91.81% |
| 11 | Lennox Employees Credit Union Marshalltown, IA | Credit Union | — | $72.7M | 91.29% |
| 12 | Des Moines Fire Department Credit Union Des Moines, IA | Credit Union | — | $3.4M | 89.17% |
| 13 | Premier Credit Union Des Moines, IA | Credit Union | — | $393.9M | 88.58% |
| 14 | Telco Triad Community Credit Union Sioux City, IA | Credit Union | — | $163.2M | 88.56% |
| 15 | Lincoln Savings Bank Reinbeck, IA | Bank | Waterloo-Cedar Falls, IA | $1.71B | 88.31% |
| 16 | Fort Dodge Family Credit Union Fort Dodge, IA | Credit Union | — | $42.4M | 87.18% |
| 17 | Members1St Community Credit Union Marshalltown, IA | Credit Union | — | $307.5M | 85.32% |
| 18 | Lee County Credit Union Keokuk, IA | Credit Union | — | $3.3M | 84.79% |
| 19 | First Security Bank and Trust Company Charles City, IA | Bank | — | $538.2M | 84.12% |
| 20 | 5 Star Community Credit Union Mount Pleasant, IA | Credit Union | — | $54.9M | 84.05% |
| 21 | The Family Credit Union Davenport, IA | Credit Union | — | $248.8M | 83.90% |
| 22 | Allen Hospital Personnel Credit Union Waterloo, IA | Credit Union | — | $5.8M | 83.42% |
| 23 | Capitol View Credit Union Des Moines, IA | Credit Union | — | $46.7M | 82.74% |
| 24 | Ace Credit Union Mason City, IA | Credit Union | — | $7.6M | 82.18% |
| 25 | Ascentra Credit Union Bettendorf, IA | Credit Union | — | $593.2M | 82.03% |
| 26 | State Bank Spencer, IA | Bank | Spencer, IA | $74.9M | 81.86% |
| 27 | 1St Gateway Credit Union Camanche, IA | Credit Union | — | $171.9M | 80.79% |
| 28 | Defiance State Bank Defiance, IA | Bank | — | $42.6M | 80.65% |
| 29 | Industrial Employees Credit Union Centerville, IA | Credit Union | — | $9.3M | 79.90% |
| 30 | Farmers Savings Bank Wever, IA | Bank | Fort Madison-Keokuk, IA-IL-MO | $130.5M | 79.75% |
| 31 | Greater Iowa Credit Union Ames, IA | Credit Union | — | $701.5M | 79.68% |
| 32 | Community State Bank Paton, IA | Bank | — | $41.4M | 78.72% |
| 33 | American Bank and Trust Company, National Association Davenport, IA | Bank | Davenport-Moline-Rock Island, IA-IL | $480.9M | 78.51% |
| 34 | North Western Employees Credit Union Council Bluffs, IA | Credit Union | — | $10.3M | 78.08% |
| 35 | Keystone Savings Bank Marengo, IA | Bank | — | $200.8M | 77.89% |
| 36 | Tri-Valley Bank Randolph, IA | Bank | — | $82.8M | 77.83% |
| 37 | Financial Plus Credit Union West Des Moines, IA | Credit Union | — | $239.6M | 77.64% |
| 38 | Holy Ghost Parish Credit Union Dubuque, IA | Credit Union | — | $34.2M | 77.50% |
| 39 | North Star Community Credit Union Cherokee, IA | Credit Union | — | $156.5M | 77.19% |
| 40 | Community 1St Credit Union Ottumwa, IA | Credit Union | — | $1.10B | 77.16% |
| 41 | Midland Credit Union Urbandale, IA | Credit Union | — | $100.5M | 77.01% |
| 42 | The Clinton National Bank Clinton, IA | Bank | Clinton, IA | $396.4M | 76.93% |
| 43 | The State Bank of Toledo Toledo, IA | Bank | — | $134.6M | 76.70% |
| 44 | Members Community Credit Union Muscatine, IA | Credit Union | — | $98.5M | 76.64% |
| 45 | BANK Wapello, IA | Bank | — | $217.4M | 76.32% |
| 46 | GreenState Credit Union North Liberty, IA | Credit Union | — | $11.19B | 76.26% |
| 47 | Affinity Credit Union Des Moines, IA | Credit Union | — | $150.9M | 76.16% |
| 48 | Iowa Trust & Savings Bank Emmetsburg, IA | Bank | — | $522.0M | 76.06% |
| 49 | Corda Credit Union Cedar Rapids, IA | Credit Union | — | $748.9M | 75.89% |
| 50 | Aim Credit Union Dubuque, IA | Credit Union | — | $199.1M | 75.79% |