| Index | Callender | Iowa | National |
| Average Test Scores | n/a | 69% | 48% |
| Student/Teacher ratio | n/a | 13:1 | 16:1 |
| Total public schools | n/a | 1,101 | 79,221 |
| Total private schools | n/a | 208 | 24,874 |
| Total post-secondary schools | n/a | 96 | 7,963 |
| Index | Callender | Iowa | National |
| Completed 8th grade | 84.8% | 89.2% | 84.3% |
| Completed high school | 83.6% | 87.7% | 83.0% |
| Completed some college | 52.4% | 59.8% | 59.4% |
| Completed associate degree | 25.3% | 38.4% | 38.5% |
| Completed bachelors | 11.5% | 27.2% | 30.3% |
| Completed masters | 1.5% | 8.7% | 11.5% |
| Completed professional degree | 0.4% | 2.7% | 3.3% |
| Completed doctorate | 0.0% | 1.1% | 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, IA schools is n/a. The average student to teacher ratio is n/a. In Callender, IA, an average of 84.8% of students have completed 8th grade and an average of 83.6% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Dayton, IA | 839 | 82% | 70.8% |
| Churdan, IA | 476 | 78% | 61.5% |
| Barnum, IA | 323 | 74% | 53.1% |
| Farnhamville, IA | 439 | 72% | 50.0% |
| Gowrie, IA | 932 | 72% | 50.0% |
| Callender, IA | 441 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| French Gulch, CA | 441 | 50% | 4.2% |
| Norman, AR | 441 | 48% | 0.5% |
| Hanover, MI | 441 | 53% | 9.4% |
| Prairie du Rocher, IL | 441 | 22% | 54.2% |
| Cement, OK | 440 | 37% | 22.4% |
| Callender, IA | 441 | n/a |
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