| 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 | 1,931 | 87% | 81.3% |
| Van Meter, IA | 1,436 | 86% | 79.9% |
| Woodward, IA | 1,280 | 86% | 78.1% |
| Alleman, IA | 447 | 85% | 77.8% |
| Waukee, IA | 23,183 | 85% | 76.3% |
| Johnston, IA | 22,844 | 82% | 69.9% |
| City | Population | Avg. Test Scores | National Avg. |
| Patterson, CA | 22,827 | 31% | 35.7% |
| Nixa, MO | 22,872 | 61% | 27.3% |
| Ruston, LA | 22,812 | 66% | 37.5% |
| Fairhope, AL | 22,887 | 69% | 44.3% |
| Vicksburg, MS | 22,799 | 36% | 24.8% |
| Johnston, IA | 22,844 | 82% | 69.9% |
Here are the best places to live in Iowa
Check out the 10 most dangerous cities in Iowa
Check out the 10 safest cities in Iowa
These are the largest cities in Iowa