| Index | Fairfax | South Dakota | National |
| Average Test Scores | n/a | 48% | 48% |
| Student/Teacher ratio | n/a | 14:1 | 16:1 |
| Total public schools | n/a | 340 | 79,221 |
| Total private schools | n/a | 76 | 24,874 |
| Total post-secondary schools | n/a | 25 | 7,963 |
| Index | Fairfax | South Dakota | National |
| Completed 8th grade | 86.3% | 89.1% | 84.3% |
| Completed high school | 85.0% | 86.8% | 83.0% |
| Completed some college | 35.0% | 60.4% | 59.4% |
| Completed associate degree | 25.0% | 38.5% | 38.5% |
| Completed bachelors | 17.5% | 27.5% | 30.3% |
| Completed masters | 0.0% | 8.1% | 11.5% |
| Completed professional degree | 0.0% | 2.5% | 3.3% |
| Completed doctorate | 0.0% | 1.2% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Fairfax. Using the proficiency score averages, the average test scores for Fairfax, SD schools is n/a. The average student to teacher ratio is n/a. In Fairfax, SD, an average of 86.3% of students have completed 8th grade and an average of 85.0% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Butte, NE | 348 | 45% | 6.3% |
| Spencer, NE | 345 | 45% | 6.8% |
| Bonesteel, SD | 386 | 40% | 16.7% |
| Fairfax, SD | 138 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Jim Falls, WI | 138 | 67% | 39.6% |
| Fort Shaw, MT | 138 | 45% | 6.3% |
| Boston, KY | 138 | 61% | 27.1% |
| Coal Center, PA | 138 | 60% | 24.0% |
| Frankfort, SD | 139 | 42% | 13.2% |
| Fairfax, SD | 138 | n/a |
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