| Index | Annex | Oregon | National |
| Average Test Scores | 35% | 47% | 49% |
| 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 |
| 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 35%. 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, State | Population | Avg. Test Scores | National Avg. |
| Fruitland, ID | 4,967 | 43% | 13% |
| Weiser, ID | 5,350 | 43% | 13% |
| Ontario, OR | 11,045 | 33% | 32% |
| Payette, ID | 7,402 | 30% | 40% |
| Huntington, OR | 314 | 25% | 49% |
| Annex, OR | 262 | 35% | 30% |
| City, State | Population | Avg. Test Scores | National Avg. |
| Red Feather Lakes, CO | 262 | 60% | 21% |
| Bluewater Village, NM | 262 | 45% | 10% |
| Wilson Creek, WA | 262 | 55% | 11% |
| New Ringgold, PA | 263 | 70% | 41% |
| Honor, MI | 261 | 40% | 20% |
| Annex, OR | 262 | 35% | 30% |
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