| Index | Sumner | Washington | National |
| Average Test Scores | 67% | 54% | 48% |
| Student/Teacher ratio | 20:1 | 20:1 | 16:1 |
| Total public schools | 14 | 1,991 | 79,221 |
| Total private schools | 1 | 548 | 24,874 |
| Total post-secondary schools | n/a | 147 | 7,963 |
| Index | Sumner | Washington | National |
| Completed 8th grade | 86.6% | 87.5% | 84.3% |
| Completed high school | 86.6% | 86.6% | 83.0% |
| Completed some college | 57.1% | 67.7% | 59.4% |
| Completed associate degree | 31.2% | 43.3% | 38.5% |
| Completed bachelors | 21.6% | 33.6% | 30.3% |
| Completed masters | 5.5% | 12.3% | 11.5% |
| Completed professional degree | 1.7% | 3.6% | 3.3% |
| Completed doctorate | 0.7% | 1.5% | 1.3% |
There are a total of 14 public schools, 1 private schools and n/a post-secondary schools in Sumner. Using the proficiency score averages, the average test scores for Sumner, WA schools is 67%. The average student to teacher ratio is 20:1. In Sumner, WA, an average of 86.6% of students have completed 8th grade and an average of 86.6% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Lake Tapps, WA | 12,129 | 78% | 62.8% |
| Carbonado, WA | 683 | 77% | 60.4% |
| Maple Valley, WA | 26,739 | 74% | 54.2% |
| University Place, WA | 33,661 | 72% | 49.1% |
| Ravensdale, WA | 814 | 72% | 49.0% |
| Sumner, WA | 10,246 | 67% | 39.0% |
| City | Population | Avg. Test Scores | National Avg. |
| Doraville, GA | 10,244 | 34% | 30.0% |
| Somers Point, NJ | 10,250 | 28% | 41.3% |
| London, OH | 10,241 | 65% | 35.0% |
| Canandaigua, NY | 10,241 | 66% | 36.8% |
| Belle Chasse, LA | 10,241 | 86% | 78.1% |
| Sumner, WA | 10,246 | 67% | 39.0% |
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