| Index | Annex | Oregon | National |
| Average Test Scores | n/a | 46% | 48% |
| Student/Teacher ratio | n/a | 20:1 | 16:1 |
| Total public schools | n/a | 1,097 | 79,221 |
| Total private schools | n/a | 361 | 24,874 |
| Total post-secondary schools | n/a | 89 | 7,963 |
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| Index | Annex | Oregon | National |
| Completed 8th grade | 71.3% | 86.3% | 84.3% |
| Completed high school | 69.1% | 85.4% | 83.0% |
| Completed some college | 39.9% | 66.1% | 59.4% |
| Completed associate degree | 11.2% | 39.9% | 38.5% |
| Completed bachelors | 5.6% | 31.4% | 30.3% |
| Completed masters | 3.9% | 11.9% | 11.5% |
| Completed professional degree | 0.6% | 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 Annex. Using the proficiency score averages, the average test scores for Annex, OR schools is n/a. The average student to teacher ratio is n/a. In Annex, OR, an average of 71.3% of students have completed 8th grade and an average of 69.1% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Fruitland, ID | 5,390 | 49% | 1.8% |
| Weiser, ID | 5,358 | 44% | 9.1% |
| Huntington, OR | 454 | 40% | 16.7% |
| Ontario, OR | 11,031 | 36% | 24.3% |
| Payette, ID | 7,655 | 26% | 45.6% |
| Annex, OR | 246 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Lowgap, NC | 246 | 45% | 7.3% |
| Houstonia, MO | 246 | 35% | 28.1% |
| Otwell, IN | 245 | 20% | 58.3% |
| Powellsville, NC | 247 | 10% | 79.2% |
| Sunizona, AZ | 247 | 50% | 4.2% |
| Annex, OR | 246 | n/a |
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