This was 13.5 percent higher than the state average of 46.3 percent. In 2020 the total municipality population reached 26,197.
94.3 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Smithtown for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 1,061 | 5.7 |
| Regular high school diploma | 3,368 | 18.1 |
| GED or alternative credential | 332 | 1.8 |
| Some college, less than 1 year | 871 | 4.7 |
| Some college, 1 or more years, no degree | 1,840 | 9.9 |
| Associate's degree | 1,768 | 9.5 |
| Bachelor's degree | 5,000 | 26.9 |
| Master's degree | 3,280 | 17.7 |
| Professional school degree | 750 | 4 |
| Doctorate degree | 302 | 1.6 |
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