| Index | Cumby | Texas | National |
| Average Test Scores | 45% | 47% | 48% |
| Student/Teacher ratio | n/a | 14:1 | 16:1 |
| Total public schools | n/a | 7,418 | 79,221 |
| Total private schools | n/a | 1,267 | 24,874 |
| Total post-secondary schools | n/a | 463 | 7,963 |
| Index | Cumby | Texas | National |
| Completed 8th grade | 76.1% | 79.3% | 84.3% |
| Completed high school | 76.1% | 77.8% | 83.0% |
| Completed some college | 41.8% | 57.3% | 59.4% |
| Completed associate degree | 21.8% | 34.9% | 38.5% |
| Completed bachelors | 16.4% | 28.1% | 30.3% |
| Completed masters | 5.8% | 9.6% | 11.5% |
| Completed professional degree | 1.0% | 2.6% | 3.3% |
| Completed doctorate | 0.4% | 1.1% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Cumby. Using the proficiency score averages, the average test scores for Cumby, TX schools is 45%. The average student to teacher ratio is n/a. In Cumby, TX, an average of 76.1% of students have completed 8th grade and an average of 76.1% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Lone Oak, TX | 644 | 49% | 2.1% |
| Sulphur Springs, TX | 16,573 | 43% | 10.9% |
| Commerce, TX | 9,703 | 36% | 25.0% |
| Campbell, TX | 963 | 29% | 40.6% |
| Cumby, TX | 836 | 45% | 7.3% |
| City | Population | Avg. Test Scores | National Avg. |
| Millersburg, IN | 836 | 60% | 24.0% |
| Garnavillo, IA | 836 | 71% | 48.3% |
| Wessington Springs, SD | 836 | 41% | 14.3% |
| Blairs, VA | 836 | 89% | 85.4% |
| Elkton, SD | 835 | 39% | 19.8% |
| Cumby, TX | 836 | 45% | 7.3% |
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