| Index | Decatur | Texas | National |
| Average Test Scores | 45% | 47% | 48% |
| Student/Teacher ratio | 14:1 | 14:1 | 16:1 |
| Total public schools | 6 | 7,418 | 79,221 |
| Total private schools | n/a | 1,267 | 24,874 |
| Total post-secondary schools | n/a | 463 | 7,963 |
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| Index | Decatur | Texas | National |
| Completed 8th grade | 79.6% | 79.3% | 84.3% |
| Completed high school | 78.8% | 77.8% | 83.0% |
| Completed some college | 53.0% | 57.3% | 59.4% |
| Completed associate degree | 26.5% | 34.9% | 38.5% |
| Completed bachelors | 19.2% | 28.1% | 30.3% |
| Completed masters | 3.7% | 9.6% | 11.5% |
| Completed professional degree | 0.4% | 2.6% | 3.3% |
| Completed doctorate | 0.0% | 1.1% | 1.3% |
There are a total of 6 public schools, n/a private schools and n/a post-secondary schools in Decatur. Using the proficiency score averages, the average test scores for Decatur, TX schools is 45%. The average student to teacher ratio is 14:1. In Decatur, TX, an average of 79.6% of students have completed 8th grade and an average of 78.8% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Alvord, TX | 1,104 | 60% | 25.0% |
| Paradise, TX | 502 | 57% | 18.2% |
| Chico, TX | 1,166 | 52% | 8.7% |
| Rhome, TX | 1,748 | 44% | 8.0% |
| Bridgeport, TX | 6,498 | 44% | 8.7% |
| Decatur, TX | 6,976 | 45% | 5.7% |
| City | Population | Avg. Test Scores | National Avg. |
| Benton, IL | 6,977 | 27% | 44.4% |
| Milltown, NJ | 6,973 | 59% | 23.4% |
| Oak Ridge, NC | 6,979 | 75% | 55.2% |
| Old Greenwich, CT | 6,980 | 87% | 80.2% |
| King, NC | 6,980 | 42% | 12.7% |
| Decatur, TX | 6,976 | 45% | 5.7% |
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