| Index | Garnavillo | Iowa | National |
| Average Test Scores | 71% | 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 | Garnavillo | Iowa | National |
| Completed 8th grade | 86.2% | 89.2% | 84.3% |
| Completed high school | 81.5% | 87.7% | 83.0% |
| Completed some college | 41.8% | 59.8% | 59.4% |
| Completed associate degree | 19.4% | 38.4% | 38.5% |
| Completed bachelors | 13.2% | 27.2% | 30.3% |
| Completed masters | 2.6% | 8.7% | 11.5% |
| Completed professional degree | 0.3% | 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 Garnavillo. Using the proficiency score averages, the average test scores for Garnavillo, IA schools is 71%. The average student to teacher ratio is n/a. In Garnavillo, IA, an average of 86.2% of students have completed 8th grade and an average of 81.5% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Monona, IA | 1,639 | 70% | 45.8% |
| Guttenberg, IA | 1,689 | 70% | 45.8% |
| McGregor, IA | 837 | 66% | 37.0% |
| Elkader, IA | 1,362 | 62% | 29.7% |
| Prairie du Chien, WI | 5,605 | 48% | 0.8% |
| Garnavillo, IA | 815 | 71% | 48.3% |
| City | Population | Avg. Test Scores | National Avg. |
| Stoddard, WI | 815 | 45% | 6.3% |
| Pocono Pines, PA | 815 | 55% | 13.5% |
| Campbellsburg, IN | 815 | 56% | 17.2% |
| Roy, WA | 814 | 47% | 2.1% |
| Ravensdale, WA | 814 | 72% | 49.0% |
| Garnavillo, IA | 815 | 71% | 48.3% |
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