| Index | Preston | Iowa | National |
| Average Test Scores | 65% | 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 | Preston | Iowa | National |
| Completed 8th grade | 92.2% | 89.2% | 84.3% |
| Completed high school | 88.4% | 87.7% | 83.0% |
| Completed some college | 48.9% | 59.8% | 59.4% |
| Completed associate degree | 29.9% | 38.4% | 38.5% |
| Completed bachelors | 13.9% | 27.2% | 30.3% |
| Completed masters | 3.3% | 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 Preston. Using the proficiency score averages, the average test scores for Preston, IA schools is 65%. The average student to teacher ratio is n/a. In Preston, IA, an average of 92.2% of students have completed 8th grade and an average of 88.4% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Delmar, IA | 491 | 82% | 70.8% |
| Goose Lake, IA | 298 | 77% | 60.9% |
| Bellevue, IA | 2,082 | 75% | 55.2% |
| Andrew, IA | 448 | 70% | 45.3% |
| Clinton, IA | 25,290 | 66% | 37.2% |
| Preston, IA | 1,013 | 65% | 34.4% |
| City | Population | Avg. Test Scores | National Avg. |
| Mounds, OK | 1,013 | 25% | 47.4% |
| Coffeeville, MS | 1,013 | 31% | 35.9% |
| Mannsville, OK | 1,013 | 40% | 16.7% |
| Baileyton, AL | 1,012 | 52% | 8.3% |
| Concord, VA | 1,012 | 77% | 60.4% |
| Preston, IA | 1,013 | 65% | 34.4% |
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