| Index | Adelphi | Maryland | National |
| Average Test Scores | 19% | 40% | 48% |
| Student/Teacher ratio | 15:1 | 16:1 | 16:1 |
| Total public schools | 5 | 1,163 | 79,221 |
| Total private schools | 1 | 674 | 24,874 |
| Total post-secondary schools | 1 | 112 | 7,963 |
| Index | Adelphi | Maryland | National |
| Completed 8th grade | 78.4% | 87.5% | 84.3% |
| Completed high school | 76.8% | 86.5% | 83.0% |
| Completed some college | 57.0% | 64.2% | 59.4% |
| Completed associate degree | 41.7% | 44.8% | 38.5% |
| Completed bachelors | 34.1% | 38.4% | 30.3% |
| Completed masters | 14.2% | 17.7% | 11.5% |
| Completed professional degree | 5.0% | 5.5% | 3.3% |
| Completed doctorate | 2.4% | 2.5% | 1.3% |
There are a total of 5 public schools, 1 private schools and 1 post-secondary schools in Adelphi. Using the proficiency score averages, the average test scores for Adelphi, MD schools is 19%. The average student to teacher ratio is 15:1. In Adelphi, MD, an average of 78.4% of students have completed 8th grade and an average of 76.8% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| McLean, VA | 48,566 | 95% | 97.1% |
| Rose Hill, VA | 21,846 | 85% | 76.0% |
| Arlington, VA | 236,434 | 83% | 72.5% |
| North Potomac, MD | 24,146 | 83% | 71.9% |
| Springfield, VA | 32,960 | 82% | 71.2% |
| Adelphi, MD | 16,364 | 19% | 59.6% |
| City | Population | Avg. Test Scores | National Avg. |
| Heber, UT | 16,362 | 43% | 10.9% |
| Red Wing, MN | 16,366 | 49% | 2.6% |
| Cañon City, CO | 16,369 | 34% | 29.3% |
| Lake St. Louis, MO | 16,357 | 71% | 48.4% |
| Dyersburg, TN | 16,371 | 50% | 3.6% |
| Adelphi, MD | 16,364 | 19% | 59.6% |
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