| Index | Garrison | Maryland | National |
| Average Test Scores | n/a | 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 | Garrison | Maryland | National |
| Completed 8th grade | 88.0% | 87.5% | 84.3% |
| Completed high school | 88.0% | 86.5% | 83.0% |
| Completed some college | 73.9% | 64.2% | 59.4% |
| Completed associate degree | 51.7% | 44.8% | 38.5% |
| Completed bachelors | 43.5% | 38.4% | 30.3% |
| Completed masters | 19.0% | 17.7% | 11.5% |
| Completed professional degree | 7.1% | 5.5% | 3.3% |
| Completed doctorate | 1.9% | 2.5% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Garrison. Using the proficiency score averages, the average test scores for Garrison, MD schools is n/a. The average student to teacher ratio is n/a. In Garrison, MD, an average of 88.0% of students have completed 8th grade and an average of 88.0% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Perry Hall, MD | 27,778 | 70% | 46.4% |
| Sykesville, MD | 3,948 | 69% | 43.8% |
| Lutherville, MD | 6,715 | 67% | 39.2% |
| Ellicott City, MD | 73,272 | 66% | 37.5% |
| Timonium, MD | 10,642 | 65% | 36.3% |
| Garrison, MD | 8,794 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Live Oak, CA | 8,794 | 46% | 5.1% |
| Thief River Falls, MN | 8,792 | 56% | 15.6% |
| Clinton, MO | 8,792 | 43% | 10.8% |
| Glenshaw, PA | 8,791 | 57% | 18.2% |
| Southside, AL | 8,801 | 57% | 18.8% |
| Garrison, MD | 8,794 | n/a |
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