| Index | Johnston | Iowa | National |
| Average Test Scores | 82% | 69% | 48% |
| Student/Teacher ratio | 14:1 | 13:1 | 16:1 |
| Total public schools | 8 | 1,101 | 79,221 |
| Total private schools | n/a | 208 | 24,874 |
| Total post-secondary schools | 1 | 96 | 7,963 |
| Index | Johnston | Iowa | National |
| Completed 8th grade | 95.4% | 89.2% | 84.3% |
| Completed high school | 95.1% | 87.7% | 83.0% |
| Completed some college | 81.4% | 59.8% | 59.4% |
| Completed associate degree | 65.8% | 38.4% | 38.5% |
| Completed bachelors | 56.7% | 27.2% | 30.3% |
| Completed masters | 20.6% | 8.7% | 11.5% |
| Completed professional degree | 6.6% | 2.7% | 3.3% |
| Completed doctorate | 2.8% | 1.1% | 1.3% |
There are a total of 8 public schools, n/a private schools and 1 post-secondary schools in Johnston. Using the proficiency score averages, the average test scores for Johnston, IA schools is 82%. The average student to teacher ratio is 14:1. In Johnston, IA, an average of 95.4% of students have completed 8th grade and an average of 95.1% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Granger, IA | 1,890 | 87% | 81.3% |
| Van Meter, IA | 1,386 | 86% | 79.9% |
| Woodward, IA | 1,235 | 86% | 78.1% |
| Alleman, IA | 438 | 85% | 77.8% |
| Waukee, IA | 22,598 | 85% | 76.3% |
| Johnston, IA | 22,077 | 82% | 69.9% |
| City | Population | Avg. Test Scores | National Avg. |
| Corcoran, CA | 22,078 | 37% | 22.2% |
| Nixa, MO | 22,086 | 61% | 27.3% |
| Villa Park, IL | 22,087 | 37% | 24.0% |
| Chester, VA | 22,098 | 77% | 60.3% |
| Happy Valley, OR | 22,049 | 59% | 23.8% |
| Johnston, IA | 22,077 | 82% | 69.9% |
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