| Index | Armstrong | 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 |
| Index | Armstrong | Missouri | National |
| Completed 8th grade | 80.5% | 86.0% | 84.3% |
| Completed high school | 77.1% | 84.2% | 83.0% |
| Completed some college | 35.6% | 57.7% | 59.4% |
| Completed associate degree | 15.1% | 35.2% | 38.5% |
| Completed bachelors | 11.2% | 27.6% | 30.3% |
| Completed masters | 1.5% | 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 Armstrong. Using the proficiency score averages, the average test scores for Armstrong, MO schools is n/a. The average student to teacher ratio is n/a. In Armstrong, MO, an average of 80.5% of students have completed 8th grade and an average of 77.1% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Fayette, MO | 2,677 | 52% | 8.7% |
| Huntsville, MO | 1,820 | 51% | 6.3% |
| Higbee, MO | 597 | 40% | 17.2% |
| Harrisburg, MO | 340 | 39% | 19.1% |
| Clifton Hill, MO | 76 | 37% | 22.9% |
| Armstrong, MO | 262 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Hayes Center, NE | 262 | 45% | 6.3% |
| Mekoryuk, AK | 262 | 20% | 58.3% |
| Laketown, UT | 262 | 54% | 11.5% |
| Klickitat, WA | 262 | 40% | 16.7% |
| Harrisonburg, LA | 262 | 80% | 65.6% |
| Armstrong, MO | 262 | n/a |
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