| Index | Zillah | Washington | National |
| Average Test Scores | 57% | 54% | 48% |
| Student/Teacher ratio | 20:1 | 20:1 | 16:1 |
| Total public schools | 4 | 1,991 | 79,221 |
| Total private schools | 1 | 548 | 24,874 |
| Total post-secondary schools | n/a | 147 | 7,963 |
| Index | Zillah | Washington | National |
| Completed 8th grade | 74.2% | 87.5% | 84.3% |
| Completed high school | 72.9% | 86.6% | 83.0% |
| Completed some college | 45.1% | 67.7% | 59.4% |
| Completed associate degree | 27.3% | 43.3% | 38.5% |
| Completed bachelors | 17.5% | 33.6% | 30.3% |
| Completed masters | 8.6% | 12.3% | 11.5% |
| Completed professional degree | 0.6% | 3.6% | 3.3% |
| Completed doctorate | 0.4% | 1.5% | 1.3% |
There are a total of 4 public schools, 1 private schools and n/a post-secondary schools in Zillah. Using the proficiency score averages, the average test scores for Zillah, WA schools is 57%. The average student to teacher ratio is 20:1. In Zillah, WA, an average of 74.2% of students have completed 8th grade and an average of 72.9% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Moxee, WA | 4,111 | 65% | 35.4% |
| Union Gap, WA | 6,167 | 57% | 17.7% |
| Yakima, WA | 93,829 | 48% | 0.2% |
| Sunnyside, WA | 16,703 | 45% | 6.4% |
| Outlook, WA | 158 | 35% | 27.1% |
| Zillah, WA | 3,137 | 57% | 19.5% |
| City | Population | Avg. Test Scores | National Avg. |
| Milbank, SD | 3,137 | 51% | 6.3% |
| Mamou, LA | 3,137 | 77% | 59.9% |
| Knoxville, IL | 3,137 | 25% | 47.2% |
| Elgin, OK | 3,137 | 38% | 20.8% |
| Cleveland, OK | 3,138 | 27% | 43.8% |
| Zillah, WA | 3,137 | 57% | 19.5% |
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