| Index | Placentia | California | National |
| Average Test Scores | 55% | 43% | 48% |
| Student/Teacher ratio | 22:1 | 20:1 | 16:1 |
| Total public schools | 30 | 8,308 | 79,221 |
| Total private schools | 2 | 3,438 | 24,874 |
| Total post-secondary schools | n/a | 1,085 | 7,963 |
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| Index | Placentia | California | National |
| Completed 8th grade | 85.1% | 81.1% | 84.3% |
| Completed high school | 84.2% | 79.8% | 83.0% |
| Completed some college | 68.6% | 61.5% | 59.4% |
| Completed associate degree | 45.4% | 39.8% | 38.5% |
| Completed bachelors | 36.7% | 32.0% | 30.3% |
| Completed masters | 12.8% | 11.9% | 11.5% |
| Completed professional degree | 3.2% | 3.9% | 3.3% |
| Completed doctorate | 1.0% | 1.6% | 1.3% |
There are a total of 30 public schools, 2 private schools and n/a post-secondary schools in Placentia. Using the proficiency score averages, the average test scores for Placentia, CA schools is 55%. The average student to teacher ratio is 22:1. In Placentia, CA, an average of 85.1% of students have completed 8th grade and an average of 84.2% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Los Alamitos, CA | 11,521 | 82% | 70.1% |
| Seal Beach, CA | 24,268 | 75% | 55.2% |
| Irvine, CA | 272,694 | 73% | 51.5% |
| Yorba Linda, CA | 68,103 | 72% | 50.3% |
| Cypress, CA | 49,137 | 71% | 47.5% |
| Placentia, CA | 52,049 | 55% | 14.1% |
| City | Population | Avg. Test Scores | National Avg. |
| Bentonville, AR | 52,070 | 67% | 40.1% |
| Oak Park, IL | 52,102 | 49% | 2.5% |
| Queen Creek, AZ | 52,162 | 57% | 18.5% |
| Edina, MN | 52,215 | 76% | 58.2% |
| Olympia, WA | 52,290 | 64% | 33.0% |
| Placentia, CA | 52,049 | 55% | 14.1% |
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