| Index | Killeen | Texas | National |
| Average Test Scores | 38% | 47% | 48% |
| Student/Teacher ratio | 17:1 | 14:1 | 16:1 |
| Total public schools | 43 | 7,418 | 79,221 |
| Total private schools | 5 | 1,267 | 24,874 |
| Total post-secondary schools | 1 | 463 | 7,963 |
| Index | Killeen | Texas | National |
| Completed 8th grade | 87.1% | 79.3% | 84.3% |
| Completed high school | 86.5% | 77.8% | 83.0% |
| Completed some college | 65.3% | 57.3% | 59.4% |
| Completed associate degree | 30.4% | 34.9% | 38.5% |
| Completed bachelors | 18.0% | 28.1% | 30.3% |
| Completed masters | 5.1% | 9.6% | 11.5% |
| Completed professional degree | 1.1% | 2.6% | 3.3% |
| Completed doctorate | 0.4% | 1.1% | 1.3% |
There are a total of 43 public schools, 5 private schools and 1 post-secondary schools in Killeen. Using the proficiency score averages, the average test scores for Killeen, TX schools is 38%. The average student to teacher ratio is 17:1. In Killeen, TX, an average of 87.1% of students have completed 8th grade and an average of 86.5% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Fort Hood, TX | 23,302 | 57% | 19.5% |
| Salado, TX | 2,848 | 52% | 8.7% |
| Harker Heights, TX | 31,657 | 50% | 4.7% |
| Nolanville, TX | 5,732 | 50% | 3.6% |
| Belton, TX | 22,173 | 45% | 6.3% |
| Killeen, TX | 148,573 | 38% | 21.8% |
| City | Population | Avg. Test Scores | National Avg. |
| Naperville, IL | 147,734 | 65% | 35.1% |
| Rockford, IL | 147,441 | 17% | 65.2% |
| Joliet, IL | 147,323 | 23% | 51.6% |
| Escondido, CA | 150,396 | 38% | 20.1% |
| Bellevue, WA | 146,145 | 72% | 49.9% |
| Killeen, TX | 148,573 | 38% | 21.8% |
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