| Index | Gray | 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 |
| Index | Gray | Iowa | National |
| Completed 8th grade | 95.8% | 89.2% | 84.3% |
| Completed high school | 92.7% | 87.7% | 83.0% |
| Completed some college | 41.7% | 59.8% | 59.4% |
| Completed associate degree | 21.9% | 38.4% | 38.5% |
| Completed bachelors | 17.7% | 27.2% | 30.3% |
| Completed masters | 0.0% | 8.7% | 11.5% |
| Completed professional degree | 0.0% | 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 Gray. Using the proficiency score averages, the average test scores for Gray, IA schools is n/a. The average student to teacher ratio is n/a. In Gray, IA, an average of 95.8% of students have completed 8th grade and an average of 92.7% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Irwin, IA | 327 | 80% | 66.7% |
| Manning, IA | 1,550 | 76% | 57.8% |
| Audubon, IA | 2,054 | 68% | 42.2% |
| Glidden, IA | 1,027 | 66% | 37.0% |
| Gray, IA | 34 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Deputy, IN | 34 | 65% | 35.4% |
| Amado, AZ | 34 | 22% | 54.2% |
| Cotopaxi, CO | 34 | 40% | 17.2% |
| Chignik Lagoon, AK | 35 | 50% | 4.2% |
| Langdon, KS | 33 | 22% | 54.2% |
| Gray, IA | 34 | n/a |
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