| Index | Garden City | New York | National |
| Average Test Scores | 83% | 56% | 48% |
| Student/Teacher ratio | n/a | n/a | 16:1 |
| Total public schools | 8 | 4,060 | 79,221 |
| Total private schools | 3 | 1,092 | 24,874 |
| Total post-secondary schools | 7 | 483 | 7,963 |
| Index | Garden City | New York | National |
| Completed 8th grade | 97.2% | 83.5% | 84.3% |
| Completed high school | 97.0% | 82.1% | 83.0% |
| Completed some college | 87.3% | 59.5% | 59.4% |
| Completed associate degree | 77.0% | 43.4% | 38.5% |
| Completed bachelors | 71.4% | 34.7% | 30.3% |
| Completed masters | 34.8% | 15.1% | 11.5% |
| Completed professional degree | 12.2% | 4.2% | 3.3% |
| Completed doctorate | 2.0% | 1.5% | 1.3% |
There are a total of 8 public schools, 3 private schools and 7 post-secondary schools in Garden City. Using the proficiency score averages, the average test scores for Garden City, NY schools is 83%. The average student to teacher ratio is n/a. In Garden City, NY, an average of 97.2% of students have completed 8th grade and an average of 97.0% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Sea Cliff, NY | 5,045 | 92% | 91.7% |
| Cedarhurst, NY | 6,642 | 91% | 89.6% |
| Old Westbury, NY | 4,618 | 91% | 88.5% |
| Jericho, NY | 13,928 | 90% | 87.1% |
| Old Bethpage, NY | 5,450 | 90% | 86.5% |
| Garden City, NY | 22,384 | 83% | 73.2% |
| City | Population | Avg. Test Scores | National Avg. |
| Middletown, DE | 22,350 | 55% | 15.1% |
| Patterson, CA | 22,309 | 31% | 35.7% |
| Waynesboro, VA | 22,300 | 71% | 47.3% |
| Lennox, CA | 22,476 | 46% | 3.4% |
| Highland, IN | 22,479 | 50% | 4.2% |
| Garden City, NY | 22,384 | 83% | 73.2% |
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