| Index | Mercer | Missouri | National |
| Average Test Scores | 38% | 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 |
| Index | Mercer | Missouri | National |
| Completed 8th grade | 85.6% | 86.0% | 84.3% |
| Completed high school | 82.8% | 84.2% | 83.0% |
| Completed some college | 38.8% | 57.7% | 59.4% |
| Completed associate degree | 22.3% | 35.2% | 38.5% |
| Completed bachelors | 16.5% | 27.6% | 30.3% |
| Completed masters | 10.0% | 10.4% | 11.5% |
| Completed professional degree | 2.4% | 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 Mercer. Using the proficiency score averages, the average test scores for Mercer, MO schools is 38%. The average student to teacher ratio is n/a. In Mercer, MO, an average of 85.6% of students have completed 8th grade and an average of 82.8% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Princeton, MO | 1,211 | 50% | 3.1% |
| Newtown, MO | 290 | 40% | 16.7% |
| Cainsville, MO | 203 | 35% | 27.1% |
| Mercer, MO | 323 | 38% | 21.9% |
| City | Population | Avg. Test Scores | National Avg. |
| Barnum, IA | 323 | 74% | 53.1% |
| Medora, IL | 323 | 33% | 32.3% |
| Patrick, SC | 323 | 60% | 24.0% |
| Bridgewater, SD | 322 | 70% | 44.8% |
| Montezuma Creek, UT | 324 | 15% | 69.8% |
| Mercer, MO | 323 | 38% | 21.9% |
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