| Index | Decatur | Tennessee | National |
| Average Test Scores | 34% | 35% | 48% |
| Student/Teacher ratio | n/a | n/a | 16:1 |
| Total public schools | 4 | 1,390 | 79,221 |
| Total private schools | n/a | 430 | 24,874 |
| Total post-secondary schools | n/a | 189 | 7,963 |
| Index | Decatur | Tennessee | National |
| Completed 8th grade | 80.5% | 82.0% | 84.3% |
| Completed high school | 78.8% | 79.9% | 83.0% |
| Completed some college | 38.3% | 53.2% | 59.4% |
| Completed associate degree | 19.6% | 32.2% | 38.5% |
| Completed bachelors | 9.9% | 25.4% | 30.3% |
| Completed masters | 3.5% | 9.3% | 11.5% |
| Completed professional degree | 1.0% | 2.8% | 3.3% |
| Completed doctorate | 0.0% | 1.2% | 1.3% |
There are a total of 4 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, TN schools is 34%. The average student to teacher ratio is n/a. In Decatur, TN, an average of 80.5% of students have completed 8th grade and an average of 78.8% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Dayton, TN | 7,357 | 43% | 9.6% |
| Riceville, TN | 771 | 41% | 14.6% |
| Athens, TN | 13,931 | 38% | 21.5% |
| Spring City, TN | 2,242 | 37% | 22.9% |
| Etowah, TN | 3,505 | 36% | 26.0% |
| Decatur, TN | 1,612 | 34% | 28.9% |
| City | Population | Avg. Test Scores | National Avg. |
| New Buffalo, MI | 1,613 | 65% | 34.7% |
| Nescopeck, PA | 1,613 | 75% | 55.2% |
| Sharon, WI | 1,613 | 32% | 33.3% |
| Pine Valley, CA | 1,611 | 33% | 31.9% |
| Dauphin Island, AL | 1,610 | 70% | 45.8% |
| Decatur, TN | 1,612 | 34% | 28.9% |
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