| Index | Garrison | 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 |
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| Index | Garrison | Iowa | National |
| Completed 8th grade | 84.6% | 89.2% | 84.3% |
| Completed high school | 83.3% | 87.7% | 83.0% |
| Completed some college | 44.3% | 59.8% | 59.4% |
| Completed associate degree | 23.6% | 38.4% | 38.5% |
| Completed bachelors | 9.8% | 27.2% | 30.3% |
| Completed masters | 2.8% | 8.7% | 11.5% |
| Completed professional degree | 0.8% | 2.7% | 3.3% |
| Completed doctorate | 0.8% | 1.1% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Garrison. Using the proficiency score averages, the average test scores for Garrison, IA schools is n/a. The average student to teacher ratio is n/a. In Garrison, IA, an average of 84.6% of students have completed 8th grade and an average of 83.3% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Shellsburg, IA | 806 | 82% | 70.8% |
| Urbana, IA | 1,462 | 82% | 70.8% |
| Vinton, IA | 5,075 | 80% | 66.0% |
| Dysart, IA | 1,416 | 78% | 61.5% |
| La Porte City, IA | 2,556 | 77% | 60.4% |
| Garrison, IA | 279 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Harrison, ID | 279 | 38% | 21.9% |
| Kelliher, MN | 279 | 42% | 12.5% |
| Wallace, NE | 279 | 60% | 25.0% |
| Saco, MT | 279 | 43% | 11.5% |
| Belleville, NY | 279 | 54% | 12.5% |
| Garrison, IA | 279 | n/a |
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