| Northfield - Population Characteristics | FIPS Code=23065 |
| 1970 | 1980 | 1990 | |
| Population Density (Persons per Square Mile) | 211.74 | 236.30 | 127.50 |
| Total Population | 4870 | 5435 | 5610 |
| Per Cent of Popualtion Born within Vermont | 52.09 | 52.79 | 51.10 |
| Number of Families | 1039 | 1105 | 1194 |
| Per Cent of Population Aged 18 or Younger | 29.23 | 22.93 | 22.87 |
| Per Cent of Population Aged 18 to 64 | 61.72 | 66.09 | 66.76 |
| Per Cent of Population Aged 65 or Older | 9.05 | 10.98 | 10.61 |