| Index | Preston | Maryland | National |
| Average Test Scores | 45% | 40% | 48% |
| Student/Teacher ratio | n/a | 16:1 | 16:1 |
| Total public schools | n/a | 1,163 | 79,221 |
| Total private schools | n/a | 674 | 24,874 |
| Total post-secondary schools | n/a | 112 | 7,963 |
| Index | Preston | Maryland | National |
| Completed 8th grade | 89.9% | 87.5% | 84.3% |
| Completed high school | 88.6% | 86.5% | 83.0% |
| Completed some college | 47.4% | 64.2% | 59.4% |
| Completed associate degree | 31.0% | 44.8% | 38.5% |
| Completed bachelors | 24.3% | 38.4% | 30.3% |
| Completed masters | 6.5% | 17.7% | 11.5% |
| Completed professional degree | 0.9% | 5.5% | 3.3% |
| Completed doctorate | 0.4% | 2.5% | 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, MD schools is 45%. The average student to teacher ratio is n/a. In Preston, MD, an average of 89.9% of students have completed 8th grade and an average of 88.6% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Church Creek, MD | 75 | 65% | 34.4% |
| Cordova, MD | 551 | 62% | 29.2% |
| Secretary, MD | 497 | 52% | 8.3% |
| Trappe, MD | 1,153 | 52% | 8.3% |
| Denton, MD | 4,488 | 40% | 17.7% |
| Preston, MD | 861 | 45% | 7.3% |
| City | Population | Avg. Test Scores | National Avg. |
| Utica, MS | 861 | 41% | 14.6% |
| Happy Camp, CA | 861 | 31% | 34.9% |
| Michie, TN | 860 | 34% | 29.2% |
| Hermitage, AR | 862 | 31% | 35.9% |
| Hollister, NC | 860 | 27% | 43.8% |
| Preston, MD | 861 | 45% | 7.3% |
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