| Index | Southold | New York | National |
| Average Test Scores | 53% | 56% | 48% |
| Student/Teacher ratio | n/a | n/a | 16:1 |
| Total public schools | 2 | 4,060 | 79,221 |
| Total private schools | n/a | 1,092 | 24,874 |
| Total post-secondary schools | n/a | 483 | 7,963 |
| Index | Southold | New York | National |
| Completed 8th grade | 95.9% | 83.5% | 84.3% |
| Completed high school | 95.9% | 82.1% | 83.0% |
| Completed some college | 69.9% | 59.5% | 59.4% |
| Completed associate degree | 50.8% | 43.4% | 38.5% |
| Completed bachelors | 37.3% | 34.7% | 30.3% |
| Completed masters | 17.6% | 15.1% | 11.5% |
| Completed professional degree | 5.2% | 4.2% | 3.3% |
| Completed doctorate | 1.0% | 1.5% | 1.3% |
There are a total of 2 public schools, n/a private schools and n/a post-secondary schools in Southold. Using the proficiency score averages, the average test scores for Southold, NY schools is 53%. The average student to teacher ratio is n/a. In Southold, NY, an average of 95.9% of students have completed 8th grade and an average of 95.9% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Mattituck, NY | 5,017 | 77% | 60.4% |
| Sag Harbor, NY | 2,034 | 65% | 34.4% |
| East Hampton, NY | 948 | 63% | 31.0% |
| Cutchogue, NY | 3,031 | 59% | 21.9% |
| Hampton Bays, NY | 15,184 | 57% | 19.1% |
| Southold, NY | 6,075 | 53% | 10.9% |
| City | Population | Avg. Test Scores | National Avg. |
| Littlefield, TX | 6,076 | 41% | 15.6% |
| Morris Plains, NJ | 6,076 | 72% | 50.0% |
| Kingston, TN | 6,077 | 41% | 15.4% |
| Hidden Valley Lake, CA | 6,072 | 50% | 4.2% |
| Hampshire, IL | 6,080 | 44% | 8.1% |
| Southold, NY | 6,075 | 53% | 10.9% |
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