| Index | Twain Harte | California | National |
| Average Test Scores | 47% | 43% | 48% |
| Student/Teacher ratio | 11:1 | 20:1 | 16:1 |
| Total public schools | 4 | 8,308 | 79,221 |
| Total private schools | 1 | 3,438 | 24,874 |
| Total post-secondary schools | n/a | 1,085 | 7,963 |
| Index | Twain Harte | California | National |
| Completed 8th grade | 94.8% | 81.1% | 84.3% |
| Completed high school | 94.1% | 79.8% | 83.0% |
| Completed some college | 71.9% | 61.5% | 59.4% |
| Completed associate degree | 43.7% | 39.8% | 38.5% |
| Completed bachelors | 34.1% | 32.0% | 30.3% |
| Completed masters | 10.5% | 11.9% | 11.5% |
| Completed professional degree | 1.3% | 3.9% | 3.3% |
| Completed doctorate | 0.0% | 1.6% | 1.3% |
There are a total of 4 public schools, 1 private schools and n/a post-secondary schools in Twain Harte. Using the proficiency score averages, the average test scores for Twain Harte, CA schools is 47%. The average student to teacher ratio is 11:1. In Twain Harte, CA, an average of 94.8% of students have completed 8th grade and an average of 94.1% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Chinese Camp, CA | 146 | 60% | 25.0% |
| Murphys, CA | 1,944 | 57% | 18.8% |
| Avery, CA | 444 | 52% | 8.3% |
| Arnold, CA | 2,099 | 50% | 3.1% |
| Groveland, CA | 249 | 41% | 14.6% |
| Twain Harte, CA | 2,502 | 47% | 2.1% |
| City | Population | Avg. Test Scores | National Avg. |
| Janesville, MN | 2,502 | 50% | 3.1% |
| Lineville, AL | 2,501 | 37% | 22.9% |
| Frankfort, NY | 2,503 | 53% | 10.4% |
| Leachville, AR | 2,498 | 58% | 20.8% |
| Silver Lake, WI | 2,506 | 62% | 28.1% |
| Twain Harte, CA | 2,502 | 47% | 2.1% |
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