| Index | Riverhead | New York | National |
| Average Test Scores | 36% | 56% | 48% |
| Student/Teacher ratio | n/a | n/a | 16:1 |
| Total public schools | 6 | 4,060 | 79,221 |
| Total private schools | 2 | 1,092 | 24,874 |
| Total post-secondary schools | n/a | 483 | 7,963 |
| Index | Riverhead | New York | National |
| Completed 8th grade | 81.2% | 83.5% | 84.3% |
| Completed high school | 79.4% | 82.1% | 83.0% |
| Completed some college | 48.7% | 59.5% | 59.4% |
| Completed associate degree | 30.7% | 43.4% | 38.5% |
| Completed bachelors | 18.6% | 34.7% | 30.3% |
| Completed masters | 5.1% | 15.1% | 11.5% |
| Completed professional degree | 1.1% | 4.2% | 3.3% |
| Completed doctorate | 0.4% | 1.5% | 1.3% |
There are a total of 6 public schools, 2 private schools and n/a post-secondary schools in Riverhead. Using the proficiency score averages, the average test scores for Riverhead, NY schools is 36%. The average student to teacher ratio is n/a. In Riverhead, NY, an average of 81.2% of students have completed 8th grade and an average of 79.4% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Shoreham, NY | 390 | 82% | 69.8% |
| Quogue, NY | 623 | 80% | 66.7% |
| Mattituck, NY | 5,017 | 77% | 60.4% |
| Westhampton Beach, NY | 1,911 | 73% | 51.7% |
| Brookhaven, NY | 3,306 | 66% | 37.0% |
| Riverhead, NY | 14,287 | 36% | 25.8% |
| City | Population | Avg. Test Scores | National Avg. |
| Hazel Crest, IL | 14,284 | 21% | 56.0% |
| Hidalgo, TX | 14,290 | 45% | 7.1% |
| Fergus Falls, MN | 14,278 | 53% | 11.3% |
| Loveland, OH | 14,297 | 84% | 74.1% |
| Maumee, OH | 14,267 | 65% | 34.8% |
| Riverhead, NY | 14,287 | 36% | 25.8% |
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