| Index | Callender | California | National |
| Average Test Scores | n/a | 43% | 48% |
| Student/Teacher ratio | n/a | 20:1 | 16:1 |
| Total public schools | n/a | 8,308 | 79,221 |
| Total private schools | n/a | 3,438 | 24,874 |
| Total post-secondary schools | n/a | 1,085 | 7,963 |
| Index | Callender | California | National |
| Completed 8th grade | 91.2% | 81.1% | 84.3% |
| Completed high school | 91.2% | 79.8% | 83.0% |
| Completed some college | 78.8% | 61.5% | 59.4% |
| Completed associate degree | 40.2% | 39.8% | 38.5% |
| Completed bachelors | 27.8% | 32.0% | 30.3% |
| Completed masters | 7.3% | 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 n/a public schools, n/a private schools and n/a post-secondary schools in Callender. Using the proficiency score averages, the average test scores for Callender, CA schools is n/a. The average student to teacher ratio is n/a. In Callender, CA, an average of 91.2% of students have completed 8th grade and an average of 91.2% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| San Luis Obispo, CA | 47,402 | 56% | 17.3% |
| Pismo Beach, CA | 8,042 | 56% | 16.7% |
| Arroyo Grande, CA | 17,924 | 49% | 1.9% |
| Nipomo, CA | 18,182 | 46% | 4.2% |
| Grover Beach, CA | 13,481 | 45% | 6.9% |
| Callender, CA | 1,638 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Bear Creek, AL | 1,638 | 40% | 17.7% |
| Shasta, CA | 1,639 | 45% | 7.3% |
| Monona, IA | 1,639 | 70% | 45.8% |
| Worthington, KY | 1,639 | 49% | 2.1% |
| Industry, PA | 1,637 | 62% | 29.2% |
| Callender, CA | 1,638 | n/a |
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