| Index | Castana | 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 | Castana | Iowa | National |
| Completed 8th grade | 79.3% | 89.2% | 84.3% |
| Completed high school | 75.6% | 87.7% | 83.0% |
| Completed some college | 43.9% | 59.8% | 59.4% |
| Completed associate degree | 20.7% | 38.4% | 38.5% |
| Completed bachelors | 6.1% | 27.2% | 30.3% |
| Completed masters | 4.9% | 8.7% | 11.5% |
| Completed professional degree | 2.4% | 2.7% | 3.3% |
| Completed doctorate | 2.4% | 1.1% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Castana. Using the proficiency score averages, the average test scores for Castana, IA schools is n/a. The average student to teacher ratio is n/a. In Castana, IA, an average of 79.3% of students have completed 8th grade and an average of 75.6% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Whiting, IA | 829 | 68% | 40.6% |
| Mapleton, IA | 1,173 | 67% | 40.1% |
| Onawa, IA | 2,788 | 66% | 36.5% |
| Castana, IA | 205 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Posen, MI | 205 | 50% | 4.2% |
| Rhame, ND | 205 | 50% | 4.2% |
| Trout Creek, MT | 205 | 50% | 4.2% |
| Keller, WA | 204 | 30% | 37.5% |
| Winnett, MT | 206 | 45% | 6.3% |
| Castana, IA | 205 | n/a |
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