| Index | Mill Spring | Missouri | National |
| Average Test Scores | n/a | 44% | 48% |
| Student/Teacher ratio | n/a | 14:1 | 16:1 |
| Total public schools | n/a | 1,899 | 79,221 |
| Total private schools | n/a | 531 | 24,874 |
| Total post-secondary schools | n/a | 213 | 7,963 |
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| Index | Mill Spring | Missouri | National |
| Completed 8th grade | 56.0% | 86.0% | 84.3% |
| Completed high school | 48.8% | 84.2% | 83.0% |
| Completed some college | 8.3% | 57.7% | 59.4% |
| Completed associate degree | 4.8% | 35.2% | 38.5% |
| Completed bachelors | 2.4% | 27.6% | 30.3% |
| Completed masters | 0.0% | 10.4% | 11.5% |
| Completed professional degree | 0.0% | 2.8% | 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 Mill Spring. Using the proficiency score averages, the average test scores for Mill Spring, MO schools is n/a. The average student to teacher ratio is n/a. In Mill Spring, MO, an average of 56.0% of students have completed 8th grade and an average of 48.8% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Williamsville, MO | 336 | 50% | 4.2% |
| Piedmont, MO | 3,550 | 38% | 20.8% |
| Ellsinore, MO | 654 | 38% | 20.8% |
| Greenville, MO | 519 | 37% | 22.9% |
| Mill Spring, MO | 139 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Mackey, IN | 139 | 67% | 39.6% |
| Frankfort, SD | 139 | 42% | 13.2% |
| Winifred, MT | 139 | 60% | 25.0% |
| Allen, KS | 140 | 25% | 47.9% |
| Jim Falls, WI | 138 | 67% | 39.6% |
| Mill Spring, MO | 139 | n/a |
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