| Index | Clearlake | California | National |
| Average Test Scores | 16% | 38% | 49% |
| 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 |
| 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 16%. 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, State | Population | Avg. Test Scores | National Avg. |
| Cobb, CA | 1,122 | 62% | 26% |
| Hidden Valley Lake, CA | 5,618 | 44% | 12% |
| Middletown, CA | 771 | 42% | 14% |
| Kelseyville, CA | 3,822 | 30% | 40% |
| Lower Lake, CA | 1,558 | 29% | 41% |
| Clearlake, CA | 15,070 | 16% | 67% |
| City, State | Population | Avg. Test Scores | National Avg. |
| Sterling, IL | 15,071 | 29% | 41% |
| Cherryland, CA | 15,066 | 18% | 63% |
| Otsego, MN | 15,065 | 56% | 13% |
| Hereford, TX | 15,086 | 68% | 37% |
| Newton, IA | 15,090 | 73% | 49% |
| Clearlake, CA | 15,070 | 16% | 67% |
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