| Index | Castle Rock | Washington | National |
| Average Test Scores | 46% | 54% | 48% |
| Student/Teacher ratio | 22:1 | 20:1 | 16:1 |
| Total public schools | 3 | 1,991 | 79,221 |
| Total private schools | n/a | 548 | 24,874 |
| Total post-secondary schools | n/a | 147 | 7,963 |
| Index | Castle Rock | Washington | National |
| Completed 8th grade | 83.5% | 87.5% | 84.3% |
| Completed high school | 82.3% | 86.6% | 83.0% |
| Completed some college | 58.2% | 67.7% | 59.4% |
| Completed associate degree | 27.6% | 43.3% | 38.5% |
| Completed bachelors | 16.8% | 33.6% | 30.3% |
| Completed masters | 5.2% | 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 3 public schools, n/a private schools and n/a post-secondary schools in Castle Rock. Using the proficiency score averages, the average test scores for Castle Rock, WA schools is 46%. The average student to teacher ratio is 22:1. In Castle Rock, WA, an average of 83.5% of students have completed 8th grade and an average of 82.3% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Toledo, WA | 532 | 57% | 19.0% |
| Kelso, WA | 12,237 | 46% | 5.0% |
| Longview, WA | 37,914 | 43% | 9.6% |
| Rainier, OR | 2,080 | 37% | 23.3% |
| Clatskanie, OR | 2,189 | 28% | 41.1% |
| Castle Rock, WA | 2,917 | 46% | 5.2% |
| City | Population | Avg. Test Scores | National Avg. |
| Chaffee, MO | 2,917 | 31% | 35.9% |
| Seaside Heights, NJ | 2,917 | 22% | 54.2% |
| Sumner, IL | 2,916 | 45% | 7.3% |
| Brownstown, IN | 2,920 | 48% | 0.7% |
| Hildale, UT | 2,921 | 32% | 33.3% |
| Castle Rock, WA | 2,917 | 46% | 5.2% |
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