RANKING ·
Highest net interest margin in South Dakota
12 of 33 credit unions in South Dakota that filed for the quarter ended June 30, 2026 are ranked. At least $100 million in total assets. Institutions with equal values share a rank. Source: NCUA Call Report data.
| Rank | Institution | Headquarters | Net interest margin on average assets | Total assets |
|---|---|---|---|---|
| 1 | Sentinel Federal Credit Union | Box Elder, SD | 4.30% | $199 million |
| 2 | Levo Federal Credit Union | Sioux Falls, SD | 4.20% | $516 million |
| 3 | Northern Hills Federal Credit Union | Sturgis, SD | 4.09% | $205 million |
| 4 | Service First Federal Credit Union | Sioux Falls, SD | 4.08% | $210 million |
| 5 | Explorers Federal Credit Union | Yankton, SD | 4.04% | $111 million |
| 6 | Area Federal Credit Union | Aberdeen, SD | 3.91% | $200 million |
| 7 | Voyage Federal Credit Union | Sioux Falls, SD | 3.85% | $285 million |
| 8 | Highmark Federal Credit Union | Rapid City, SD | 3.75% | $258 million |
| 9 | Bluestone Federal Credit Union | Sioux Falls, SD | 3.66% | $206 million |
| 10 | Dakotaland Federal Credit Union | Huron, SD | 3.56% | $752 million |
| 11 | Aspen Federal Credit Union | Rapid City, SD | 3.36% | $173 million |
| 12 | Black Hills Federal Credit Union | Rapid City, SD | 3.25% | $2.4 billion |
Rankings sort one published measure; they are not an overall judgment of any institution. Methodology · All rankings