| Index | Barnhart | Missouri | National |
| Average Test Scores | 46% | 44% | 48% |
| Student/Teacher ratio | 14:1 | 14:1 | 16:1 |
| Total public schools | 1 | 1,899 | 79,221 |
| Total private schools | n/a | 531 | 24,874 |
| Total post-secondary schools | n/a | 213 | 7,963 |
| Index | Barnhart | Missouri | National |
| Completed 8th grade | 88.3% | 86.0% | 84.3% |
| Completed high school | 88.3% | 84.2% | 83.0% |
| Completed some college | 59.5% | 57.7% | 59.4% |
| Completed associate degree | 35.8% | 35.2% | 38.5% |
| Completed bachelors | 23.7% | 27.6% | 30.3% |
| Completed masters | 4.9% | 10.4% | 11.5% |
| Completed professional degree | 0.8% | 2.8% | 3.3% |
| Completed doctorate | 0.3% | 1.2% | 1.3% |
There are a total of 1 public schools, n/a private schools and n/a post-secondary schools in Barnhart. Using the proficiency score averages, the average test scores for Barnhart, MO schools is 46%. The average student to teacher ratio is 14:1. In Barnhart, MO, an average of 88.3% of students have completed 8th grade and an average of 88.3% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Sappington, MO | 7,161 | 60% | 24.3% |
| Festus, MO | 12,054 | 59% | 23.1% |
| Eureka, MO | 10,203 | 59% | 22.7% |
| Waterloo, IL | 10,417 | 59% | 22.4% |
| Fenton, MO | 4,033 | 58% | 20.4% |
| Barnhart, MO | 6,676 | 46% | 5.2% |
| City | Population | Avg. Test Scores | National Avg. |
| Winthrop Harbor, IL | 6,675 | 43% | 10.9% |
| Logan, OH | 6,677 | 76% | 57.3% |
| Barrington, NJ | 6,678 | 46% | 4.2% |
| Eldridge, IA | 6,678 | 81% | 69.3% |
| Barnesville, GA | 6,673 | 31% | 35.8% |
| Barnhart, MO | 6,676 | 46% | 5.2% |
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