| Index | Clearlake | California | National |
| Average Test Scores | 33% | 43% | 48% |
| Student/Teacher ratio | 23:1 | 20:1 | 16:1 |
| Total public schools | 2 | 8,308 | 79,221 |
| Total private schools | 1 | 3,438 | 24,874 |
| Total post-secondary schools | n/a | 1,085 | 7,963 |
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| Index | Clearlake | California | National |
| Completed 8th grade | 74.2% | 81.1% | 84.3% |
| Completed high school | 72.1% | 79.8% | 83.0% |
| Completed some college | 45.1% | 61.5% | 59.4% |
| Completed associate degree | 18.4% | 39.8% | 38.5% |
| Completed bachelors | 9.1% | 32.0% | 30.3% |
| Completed masters | 3.6% | 11.9% | 11.5% |
| Completed professional degree | 1.3% | 3.9% | 3.3% |
| Completed doctorate | 0.2% | 1.6% | 1.3% |
There are a total of 2 public schools, 1 private schools and n/a post-secondary schools in Clearlake. Using the proficiency score averages, the average test scores for Clearlake, CA schools is 33%. The average student to teacher ratio is 23:1. In Clearlake, CA, an average of 74.2% of students have completed 8th grade and an average of 72.1% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Cobb, CA | 833 | 52% | 8.3% |
| Hidden Valley Lake, CA | 6,072 | 50% | 4.2% |
| Middletown, CA | 740 | 42% | 12.1% |
| Kelseyville, CA | 3,761 | 30% | 38.5% |
| Upper Lake, CA | 1,294 | 26% | 46.2% |
| Clearlake, CA | 15,774 | 33% | 31.5% |
| City | Population | Avg. Test Scores | National Avg. |
| Chubbuck, ID | 15,783 | 67% | 39.2% |
| Seymour, TN | 15,784 | 41% | 15.0% |
| Westbury, NY | 15,784 | 56% | 15.6% |
| Hudson, MA | 15,748 | 53% | 10.2% |
| Front Royal, VA | 15,811 | 76% | 58.4% |
| Clearlake, CA | 15,774 | 33% | 31.5% |
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