| Index | Harrington | Washington | National |
| Average Test Scores | 43% | 54% | 48% |
| Student/Teacher ratio | n/a | 20:1 | 16:1 |
| Total public schools | n/a | 1,991 | 79,221 |
| Total private schools | n/a | 548 | 24,874 |
| Total post-secondary schools | n/a | 147 | 7,963 |
| Index | Harrington | Washington | National |
| Completed 8th grade | 90.6% | 87.5% | 84.3% |
| Completed high school | 89.3% | 86.6% | 83.0% |
| Completed some college | 49.1% | 67.7% | 59.4% |
| Completed associate degree | 39.3% | 43.3% | 38.5% |
| Completed bachelors | 25.6% | 33.6% | 30.3% |
| Completed masters | 9.0% | 12.3% | 11.5% |
| Completed professional degree | 0.0% | 3.6% | 3.3% |
| Completed doctorate | 0.0% | 1.5% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Harrington. Using the proficiency score averages, the average test scores for Harrington, WA schools is 43%. The average student to teacher ratio is n/a. In Harrington, WA, an average of 90.6% of students have completed 8th grade and an average of 89.3% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Davenport, WA | 1,852 | 66% | 37.0% |
| Sprague, WA | 511 | 45% | 6.3% |
| Harrington, WA | 381 | 43% | 11.5% |
| City | Population | Avg. Test Scores | National Avg. |
| Mesick, MI | 381 | 31% | 34.7% |
| Bowdle, SD | 381 | 47% | 2.8% |
| Donahue, IA | 381 | 72% | 50.0% |
| Gary City, TX | 380 | 51% | 5.2% |
| Dublin, NC | 380 | 22% | 54.2% |
| Harrington, WA | 381 | 43% | 11.5% |
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