| Index | Sadler | Texas | National |
| Average Test Scores | 51% | 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 | Sadler | Texas | National |
| Completed 8th grade | 84.2% | 79.3% | 84.3% |
| Completed high school | 82.8% | 77.8% | 83.0% |
| Completed some college | 60.8% | 57.3% | 59.4% |
| Completed associate degree | 30.4% | 34.9% | 38.5% |
| Completed bachelors | 9.5% | 28.1% | 30.3% |
| Completed masters | 1.1% | 9.6% | 11.5% |
| Completed professional degree | 0.0% | 2.6% | 3.3% |
| Completed doctorate | 0.0% | 1.1% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Sadler. Using the proficiency score averages, the average test scores for Sadler, TX schools is 51%. The average student to teacher ratio is n/a. In Sadler, TX, an average of 84.2% of students have completed 8th grade and an average of 82.8% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Callisburg, TX | 240 | 64% | 32.3% |
| Tioga, TX | 958 | 56% | 15.6% |
| Whitesboro, TX | 4,043 | 55% | 14.9% |
| Pottsboro, TX | 2,418 | 52% | 8.7% |
| Howe, TX | 3,204 | 48% | 0.3% |
| Sadler, TX | 490 | 51% | 6.3% |
| City | Population | Avg. Test Scores | National Avg. |
| Gadsden, TN | 490 | 35% | 27.1% |
| Silver Creek, NE | 490 | 55% | 14.6% |
| Reserve, NM | 490 | 40% | 16.7% |
| Scotia, CA | 490 | 50% | 3.1% |
| Delmar, IA | 491 | 82% | 70.8% |
| Sadler, TX | 490 | 51% | 6.3% |
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