This was 39 percent higher than the state average of 40.5 percent. In 2020 the total municipality population reached 6,898.
98.8 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Heathrow for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 58 | 1.2 |
| Regular high school diploma | 209 | 4.2 |
| GED or alternative credential | 12 | 0.2 |
| Some college, less than 1 year | 178 | 3.6 |
| Some college, 1 or more years, no degree | 566 | 11.3 |
| Associate's degree | 243 | 4.9 |
| Bachelor's degree | 2,008 | 40.3 |
| Master's degree | 1,153 | 23.1 |
| Professional school degree | 465 | 9.3 |
| Doctorate degree | 96 | 1.9 |
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