| # | Institution | Type | Metro | Assets | Efficiency ratio |
|---|---|---|---|---|---|
| 1 | Community Federal Credit Union Chicago, IL | Credit Union | — | $116K | 543.58% |
| 2 | Shiloh Englewood Federal Credit Union Chicago, IL | Credit Union | — | $318K | 487.72% |
| 3 | St. Mark Credit Union Chicago, IL | Credit Union | — | $526K | 385.50% |
| 4 | Berean Credit Union Chicago, IL | Credit Union | — | $189K | 197.92% |
| 5 | Midland Federal Savings and Loan Association Bridgeview, IL | Bank | Chicago-Naperville-Elgin, IL-IN-WI | $111.2M | 179.26% |
| 6 | Mercer Credit Union Aledo, IL | Credit Union | — | $2.6M | 175.07% |
| 7 | St. Gregory Parish Credit Union Chicago, IL | Credit Union | — | $687K | 169.70% |
| 8 | Grand Rivers Community Bank Grand Chain, IL |
| Bank |
| — |
| $15.1M |
| 169.39% |
| 9 | Anco Community Credit Union La Salle, IL | Credit Union | — | $10.9M | 160.45% |
| 10 | Fellowship Baptist Church Credit Union Chicago, IL | Credit Union | — | $953K | 151.63% |
| 11 | C T A F C Federal Credit Union Chicago, IL | Credit Union | — | $756K | 149.65% |
| 12 | Chicago Area Office Federal Credit Union Chicago, IL | Credit Union | — | $9.5M | 141.99% |
| 13 | Alton Municipal Employees Federal Credit Union Alton, IL | Credit Union | — | $458K | 139.24% |
| 14 | South Side Community Federal Credit Union Chicago, IL | Credit Union | — | $5.4M | 131.97% |
| 15 | Bethel A.M.E. Church Credit Union Chicago, IL | Credit Union | — | $51K | 131.62% |
| 16 | Illinois Valley Credit Union Peru, IL | Credit Union | — | $37.5M | 131.39% |
| 17 | Evanston Firemens Credit Union Evanston, IL | Credit Union | — | $1.9M | 130.53% |
| 18 | Camp Grove State Bank Camp Grove, IL | Bank | Peoria, IL | $53.1M | 127.37% |
| 19 | Unified Homeowners Of Illinois Federal Credit Union Chicago, IL | Credit Union | — | $456K | 116.66% |
| 20 | Sainte Marie State Bank Sainte Marie, IL | Bank | — | $23.0M | 115.56% |
| 21 | Harvard Community Credit Union Harvard, IL | Credit Union | — | $21.2M | 115.45% |
| 22 | Peoria Bell Credit Union Peoria, IL | Credit Union | — | $6.0M | 114.68% |
| 23 | Cta-74Th Street Depot Federal Credit Union Chicago, IL | Credit Union | — | $8.4M | 112.95% |
| 24 | American Eagle Bank South Elgin, IL | Bank | Chicago-Naperville-Elgin, IL-IN-WI | $484.7M | 110.80% |
| 25 | Northside L Federal Credit Union Broadview, IL | Credit Union | — | $4.9M | 110.78% |
| 26 | Community Savings Bank Chicago, IL | Bank | Chicago-Naperville-Elgin, IL-IN-WI | $410.2M | 110.48% |
| 27 | Devon Bank Chicago, IL | Bank | Chicago-Naperville-Elgin, IL-IN-WI | $418.6M | 109.84% |
| 28 | Vicinity Credit Union Chicago, IL | Credit Union | — | $201.2M | 109.57% |
| 29 | Citizens Bank of Chatsworth Chatsworth, IL | Bank | Pontiac, IL | $36.2M | 107.49% |
| 30 | North Side Federal Savings and Loan Association of Chicago Chicago, IL | Bank | Chicago-Naperville-Elgin, IL-IN-WI | $41.8M | 106.68% |
| 31 | Maternity B.V.M. Credit Union Bourbonnais, IL | Credit Union | — | $11.3M | 105.74% |
| 32 | Burlington Northern Santa Fe Railwy Credit Union Cicero, IL | Credit Union | — | $8.1M | 105.40% |
| 33 | Williamsville State Bank & Trust Williamsville, IL | Bank | Springfield, IL | $93.8M | 105.16% |
| 34 | Kaskaskia Valley Credit Union Centralia, IL | Credit Union | — | $29.0M | 104.67% |
| 35 | Decatur Postal Credit Union Decatur, IL | Credit Union | — | $6.3M | 102.03% |
| 36 | The Federal Savings Bank Chicago, IL | Bank | Chicago-Naperville-Elgin, IL-IN-WI | $1.08B | 99.72% |
| 37 | Reavis - Stickney Credit Union Burbank, IL | Credit Union | — | $945K | 99.48% |
| 38 | 2 Rivers Area Credit Union Kankakee, IL | Credit Union | — | $26.6M | 99.45% |
| 39 | Collinsville Building and Loan Association Collinsville, IL | Bank | St. Louis, MO-IL | $117.6M | 99.34% |
| 40 | Table Grove State Bank Table Grove, IL | Bank | Peoria, IL | $45.9M | 98.83% |
| 41 | Farmers State Bank of Medora Medora, IL | Bank | St. Louis, MO-IL | $20.4M | 98.64% |
| 42 | State Employees Community Credit Union Alton, IL | Credit Union | — | $6.6M | 98.34% |
| 43 | Midwest National Bank Sandoval, IL | Bank | Centralia, IL | $122.6M | 98.18% |
| 44 | Northwest Community Credit Union Morton Grove, IL | Credit Union | — | $65.4M | 98.11% |
| 45 | Central Federal Savings and Loan Association Cicero, IL | Bank | Chicago-Naperville-Elgin, IL-IN-WI | $194.6M | 97.68% |
| 46 | Decatur Earthmover Credit Union Forsyth, IL | Credit Union | — | $314.5M | 96.63% |
| 47 | Metropolitan "L" Federal Credit Union Oak Park, IL | Credit Union | — | $9.4M | 95.89% |
| 48 | Chesterfield State Bank Chesterfield, IL | Bank | St. Louis, MO-IL | $21.7M | 95.57% |
| 49 | N.I.C.E. Federal Credit Union Geneva, IL | Credit Union | — | $2.6M | 95.36% |
| 50 | 77Th Street Depot Federal Credit Union Chicago, IL | Credit Union | — | $17.8M | 94.66% |