| Derby - Population Characteristics | FIPS Code=19035 |
| 1970 | 1980 | 1990 | |
| Population Density (Persons per Square Mile) | 171.16 | 222.21 | 91.40 |
| Total Population | 3252 | 4222 | 4479 |
| Per Cent of Popualtion Born within Vermont | 73.28 | 71.39 | 69.10 |
| Number of Families | 874 | 1139 | 1223 |
| Per Cent of Population Aged 18 or Younger | 36.06 | 30.67 | 29.81 |
| Per Cent of Population Aged 18 to 64 | 50.98 | 56.78 | 56.58 |
| Per Cent of Population Aged 65 or Older | 12.96 | 12.55 | 13.62 |