| # | Institution | Type | Metro | Assets | Efficiency ratio |
|---|---|---|---|---|---|
| 1 | Hb Telco Federal Credit Union Huron, SD | Credit Union | — | $4.9M | 128.15% |
| 2 | One American Bank Centerville, SD | Bank | Sioux Falls, SD | $285.2M | 121.66% |
| 3 | Sisseton-Wahpeton Federal Credit Union Agency Village, SD | Credit Union | — | $5.1M | 112.81% |
| 4 | Lakota Federal Credit Union Kyle, SD | Credit Union | — | $19.3M | 111.94% |
| 5 | Palace City Federal Credit Union Mitchell, SD | Credit Union | — | $16.4M | 94.68% |
| 6 | The Farmers State Bank of Turton Turton, SD | Bank | — | $41.2M | 92.93% |
| 7 | Dacotah Federal Credit Union Rapid City, SD | Credit Union | — | $11.1M | 90.68% |
| 8 | Explorers Federal Credit Union Yankton, SD |
| Credit Union |
| — |
| $112.6M |
| 90.46% |
| 9 | Coteau Valley Federal Credit Union Sisseton, SD | Credit Union | — | $18.9M | 90.21% |
| 10 | Sunrise Banks, National Association Sioux Falls, SD | Bank | Sioux Falls, SD | $2.78B | 90.07% |
| 11 | The First National Bank of Frederick Frederick, SD | Bank | Aberdeen, SD | $28.8M | 86.02% |
| 12 | Service First Federal Credit Union Sioux Falls, SD | Credit Union | — | $210.1M | 85.37% |
| 13 | Plains Commerce Bank Sioux Falls, SD | Bank | Sioux Falls, SD | $1.30B | 84.16% |
| 14 | Sentinel Federal Credit Union Box Elder, SD | Credit Union | — | $197.0M | 83.60% |
| 15 | Dakota Plains Federal Credit Union Lemmon, SD | Credit Union | — | $86.2M | 81.39% |
| 16 | Consumer's Federal Credit Union Gregory, SD | Credit Union | — | $22.1M | 80.67% |
| 17 | BankWest, Inc. Pierre, SD | Bank | Pierre, SD | $1.93B | 79.78% |
| 18 | CorTrust Bank National Association Mitchell, SD | Bank | Mitchell, SD | $1.56B | 79.74% |
| 19 | Frontier Bank Sioux Falls, SD | Bank | Sioux Falls, SD | $349.2M | 78.77% |
| 20 | State Bank of Eagle Butte Eagle Butte, SD | Bank | — | $80.3M | 78.11% |
| 21 | Dakota Star Federal Credit Union Rapid City, SD | Credit Union | — | $46.5M | 77.86% |
| 22 | Farmers State Bank of Canton Canton, SD | Bank | Sioux Falls, SD | $81.6M | 77.59% |
| 23 | Security Bank Midwest Tyndall, SD | Bank | — | $304.1M | 76.35% |
| 24 | Levo Federal Credit Union Sioux Falls, SD | Credit Union | — | $526.6M | 74.82% |
| 25 | Security State Bank Alexandria, SD | Bank | Mitchell, SD | $103.0M | 74.70% |
| 26 | Voyage Federal Credit Union Sioux Falls, SD | Credit Union | — | $282.4M | 74.33% |
| 27 | Northern Hills Federal Credit Union Sturgis, SD | Credit Union | — | $196.6M | 74.23% |
| 28 | 1st Financial Bank USA Dakota Dunes, SD | Bank | Sioux City, IA-NE-SD | $1.40B | 72.58% |
| 29 | Ft Randall Federal Credit Union Wagner, SD | Credit Union | — | $44.9M | 71.91% |
| 30 | East River Federal Credit Union Madison, SD | Credit Union | — | $41.6M | 71.69% |
| 31 | Security Savings Bank Canton, SD | Bank | Sioux Falls, SD | $557.4M | 71.60% |
| 32 | Minuteman Federal Credit Union Rapid City, SD | Credit Union | — | $16.3M | 70.92% |
| 33 | Avanti Federal Credit Union Watertown, SD | Credit Union | — | $31.8M | 70.85% |
| 34 | Sunrise Bank Dakota Onida, SD | Bank | — | $57.5M | 70.71% |
| 35 | Dakotaland Federal Credit Union Huron, SD | Credit Union | — | $739.6M | 69.59% |
| 36 | Richland State Bank Bruce, SD | Bank | Brookings, SD | $49.6M | 69.39% |
| 37 | Rushmore Electric Federal Credit Union Rapid City, SD | Credit Union | — | $29.2M | 68.64% |
| 38 | Huron Area Education Federal Credit Union Huron, SD | Credit Union | — | $18.5M | 68.62% |
| 39 | Oahe Federal Credit Union Pierre, SD | Credit Union | — | $45.0M | 67.29% |
| 40 | Dakota Rail Line Federal Credit Union Huron, SD | Credit Union | — | $5.3M | 66.82% |
| 41 | Farmers State Bank Parkston, SD | Bank | — | $254.8M | 66.26% |
| 42 | The Farmers and Merchants State Bank Scotland, SD | Bank | — | $36.0M | 65.63% |
| 43 | Community Bank Avon, SD | Bank | — | $69.3M | 65.49% |
| 44 | M O Federal Credit Union Huron, SD | Credit Union | — | $41.4M | 65.36% |
| 45 | Aspen Federal Credit Union Rapid City, SD | Credit Union | — | $167.2M | 64.04% |
| 46 | The First National Bank in Sioux Falls Sioux Falls, SD | Bank | Sioux Falls, SD | $2.12B | 62.97% |
| 47 | Western Dakota Bank Timber Lake, SD | Bank | — | $85.6M | 62.32% |
| 48 | Dacotah Bank Aberdeen, SD | Bank | Aberdeen, SD | $4.92B | 62.19% |
| 49 | Citizens State Bank, of Arlington Arlington, SD | Bank | — | $153.2M | 60.30% |
| 50 | First Bank & Trust Brookings, SD | Bank | Brookings, SD | $4.78B | 58.97% |