| Index | Thiells | New York | National |
| Average Test Scores | 53% | 56% | 48% |
| Student/Teacher ratio | n/a | n/a | 16:1 |
| Total public schools | 3 | 4,060 | 79,221 |
| Total private schools | n/a | 1,092 | 24,874 |
| Total post-secondary schools | n/a | 483 | 7,963 |
| Index | Thiells | New York | National |
| Completed 8th grade | 91.5% | 83.5% | 84.3% |
| Completed high school | 91.5% | 82.1% | 83.0% |
| Completed some college | 71.3% | 59.5% | 59.4% |
| Completed associate degree | 52.8% | 43.4% | 38.5% |
| Completed bachelors | 40.7% | 34.7% | 30.3% |
| Completed masters | 15.7% | 15.1% | 11.5% |
| Completed professional degree | 3.3% | 4.2% | 3.3% |
| Completed doctorate | 0.8% | 1.5% | 1.3% |
There are a total of 3 public schools, n/a private schools and n/a post-secondary schools in Thiells. Using the proficiency score averages, the average test scores for Thiells, NY schools is 53%. The average student to teacher ratio is n/a. In Thiells, NY, an average of 91.5% of students have completed 8th grade and an average of 91.5% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Lincolndale, NY | 1,407 | 99% | 105.2% |
| Orangeburg, NY | 4,454 | 98% | 103.1% |
| Shrub Oak, NY | 3,094 | 97% | 102.1% |
| Fort Montgomery, NY | 1,867 | 94% | 94.8% |
| Scarsdale, NY | 17,890 | 87% | 81.8% |
| Thiells, NY | 4,247 | 53% | 10.9% |
| City | Population | Avg. Test Scores | National Avg. |
| Chatsworth, GA | 4,247 | 38% | 20.3% |
| Mountain Lakes, NJ | 4,249 | 83% | 72.7% |
| Hokes Bluff, AL | 4,253 | 45% | 7.3% |
| Taylor, AZ | 4,255 | 56% | 16.7% |
| Mount Pleasant, PA | 4,255 | 55% | 14.1% |
| Thiells, NY | 4,247 | 53% | 10.9% |
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