| Index | Killen | Alabama | National |
| Average Test Scores | 58% | 44% | 48% |
| Student/Teacher ratio | 11:1 | 15:1 | 16:1 |
| Total public schools | 3 | 1,307 | 79,221 |
| Total private schools | n/a | 353 | 24,874 |
| Total post-secondary schools | n/a | 102 | 7,963 |
| Index | Killen | Alabama | National |
| Completed 8th grade | 82.4% | 80.7% | 84.3% |
| Completed high school | 80.9% | 79.2% | 83.0% |
| Completed some college | 56.9% | 53.8% | 59.4% |
| Completed associate degree | 31.8% | 31.9% | 38.5% |
| Completed bachelors | 23.1% | 24.0% | 30.3% |
| Completed masters | 8.1% | 8.9% | 11.5% |
| Completed professional degree | 2.1% | 2.5% | 3.3% |
| Completed doctorate | 0.9% | 1.0% | 1.3% |
There are a total of 3 public schools, n/a private schools and n/a post-secondary schools in Killen. Using the proficiency score averages, the average test scores for Killen, AL schools is 58%. The average student to teacher ratio is 11:1. In Killen, AL, an average of 82.4% of students have completed 8th grade and an average of 80.9% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Muscle Shoals, AL | 14,379 | 66% | 37.2% |
| Lexington, AL | 809 | 55% | 13.5% |
| Rogersville, AL | 1,464 | 54% | 12.5% |
| Florence, AL | 40,652 | 54% | 12.3% |
| Town Creek, AL | 943 | 43% | 11.5% |
| Killen, AL | 1,146 | 58% | 20.8% |
| City | Population | Avg. Test Scores | National Avg. |
| Granger, TX | 1,146 | 43% | 10.4% |
| King Cove, AK | 1,147 | 20% | 58.3% |
| Cleveland, NC | 1,147 | 46% | 5.2% |
| Daniel, UT | 1,147 | 42% | 13.5% |
| Pierceton, IN | 1,145 | 32% | 33.3% |
| Killen, AL | 1,146 | 58% | 20.8% |
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