| Chelsea - Population Characteristics | FIPS Code=17020 |
| 1970 | 1980 | 1990 | |
| Population Density (Persons per Square Mile) | 57.82 | 64.18 | 29.20 |
| Total Population | 983 | 1091 | 1166 |
| Per Cent of Popualtion Born within Vermont | 91.77 | 72.96 | 62.80 |
| Number of Families | 229 | 281 | 317 |
| Per Cent of Population Aged 18 or Younger | 22.76 | 28.69 | 27.36 |
| Per Cent of Population Aged 18 to 64 | 62.71 | 56.55 | 56.95 |
| Per Cent of Population Aged 65 or Older | 14.53 | 14.76 | 15.69 |