This was 3.8 percent lower than the state average of 48.5 percent. In 2020 the total municipality population reached 4,413.
89.4 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Northfield for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 202 | 10.6 |
| Regular high school diploma | 502 | 26.4 |
| GED or alternative credential | 46 | 2.4 |
| Some college, less than 1 year | 56 | 3 |
| Some college, 1 or more years, no degree | 244 | 12.9 |
| Associate's degree | 158 | 8.3 |
| Bachelor's degree | 423 | 22.3 |
| Master's degree | 197 | 10.4 |
| Professional school degree | 41 | 2.2 |
| Doctorate degree | 29 | 1.5 |
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