| Index | Arnold | Maryland | National |
| Average Test Scores | 62% | 40% | 48% |
| Student/Teacher ratio | 18:1 | 16:1 | 16:1 |
| Total public schools | 5 | 1,163 | 79,221 |
| Total private schools | 5 | 674 | 24,874 |
| Total post-secondary schools | 1 | 112 | 7,963 |
| Index | Arnold | Maryland | National |
| Completed 8th grade | 94.3% | 87.5% | 84.3% |
| Completed high school | 93.9% | 86.5% | 83.0% |
| Completed some college | 80.9% | 64.2% | 59.4% |
| Completed associate degree | 61.3% | 44.8% | 38.5% |
| Completed bachelors | 52.2% | 38.4% | 30.3% |
| Completed masters | 23.8% | 17.7% | 11.5% |
| Completed professional degree | 7.2% | 5.5% | 3.3% |
| Completed doctorate | 3.0% | 2.5% | 1.3% |
There are a total of 5 public schools, 5 private schools and 1 post-secondary schools in Arnold. Using the proficiency score averages, the average test scores for Arnold, MD schools is 62%. The average student to teacher ratio is 18:1. In Arnold, MD, an average of 94.3% of students have completed 8th grade and an average of 93.9% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Severna Park, MD | 38,729 | 69% | 44.6% |
| Crofton, MD | 29,482 | 65% | 34.9% |
| Crownsville, MD | 1,473 | 65% | 34.4% |
| Gambrills, MD | 2,929 | 62% | 29.5% |
| Edgemere, MD | 8,652 | 62% | 29.2% |
| Arnold, MD | 24,334 | 62% | 29.4% |
| City | Population | Avg. Test Scores | National Avg. |
| Mequon, WI | 24,357 | 67% | 38.7% |
| Papillion, NE | 24,310 | 61% | 28.0% |
| Avon Lake, OH | 24,309 | 88% | 83.2% |
| Palmetto Bay, FL | 24,308 | 73% | 52.1% |
| Okemos, MI | 24,295 | 65% | 34.6% |
| Arnold, MD | 24,334 | 62% | 29.4% |
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