| Index | Garner | Iowa | National |
| Average Test Scores | 78% | 69% | 48% |
| Student/Teacher ratio | 15:1 | 13:1 | 16:1 |
| Total public schools | 3 | 1,101 | 79,221 |
| Total private schools | n/a | 208 | 24,874 |
| Total post-secondary schools | n/a | 96 | 7,963 |
| Index | Garner | Iowa | National |
| Completed 8th grade | 95.9% | 89.2% | 84.3% |
| Completed high school | 95.0% | 87.7% | 83.0% |
| Completed some college | 64.6% | 59.8% | 59.4% |
| Completed associate degree | 45.8% | 38.4% | 38.5% |
| Completed bachelors | 26.7% | 27.2% | 30.3% |
| Completed masters | 7.3% | 8.7% | 11.5% |
| Completed professional degree | 1.8% | 2.7% | 3.3% |
| Completed doctorate | 0.0% | 1.1% | 1.3% |
There are a total of 3 public schools, n/a private schools and n/a post-secondary schools in Garner. Using the proficiency score averages, the average test scores for Garner, IA schools is 78%. The average student to teacher ratio is 15:1. In Garner, IA, an average of 95.9% of students have completed 8th grade and an average of 95.0% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Kanawha, IA | 954 | 80% | 65.6% |
| Forest City, IA | 4,117 | 75% | 55.9% |
| Ventura, IA | 761 | 74% | 54.2% |
| Britt, IA | 1,761 | 74% | 53.1% |
| Clear Lake, IA | 7,594 | 73% | 52.4% |
| Garner, IA | 3,060 | 78% | 63.0% |
| City | Population | Avg. Test Scores | National Avg. |
| Springtown, TX | 3,059 | 45% | 7.1% |
| Lula, GA | 3,061 | 34% | 30.2% |
| Kingstree, SC | 3,058 | 33% | 32.3% |
| Columbus, KS | 3,062 | 33% | 31.9% |
| Benson, MN | 3,063 | 51% | 5.2% |
| Garner, IA | 3,060 | 78% | 63.0% |
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