| Index | Index | Washington | National |
| Average Test Scores | 35% | 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 | Index | Washington | National |
| Completed 8th grade | 91.9% | 87.5% | 84.3% |
| Completed high school | 91.9% | 86.6% | 83.0% |
| Completed some college | 72.1% | 67.7% | 59.4% |
| Completed associate degree | 44.9% | 43.3% | 38.5% |
| Completed bachelors | 33.1% | 33.6% | 30.3% |
| Completed masters | 1.5% | 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 Index. Using the proficiency score averages, the average test scores for Index, WA schools is 35%. The average student to teacher ratio is n/a. In Index, WA, an average of 91.9% of students have completed 8th grade and an average of 91.9% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Gold Bar, WA | 1,995 | 55% | 13.5% |
| Sultan, WA | 5,330 | 50% | 4.9% |
| Skykomish, WA | 127 | 40% | 16.7% |
| Index, WA | 172 | 35% | 27.1% |
| City | Population | Avg. Test Scores | National Avg. |
| Spring Garden, AL | 172 | 38% | 21.9% |
| East Nicolaus, CA | 172 | 42% | 13.0% |
| Amherst, NE | 172 | 63% | 31.8% |
| Bosworth, MO | 173 | 50% | 4.2% |
| Seboyeta, NM | 173 | 20% | 58.3% |
| Index, WA | 172 | 35% | 27.1% |
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