| Clarendon - Population Characteristics | FIPS Code=21025 |
| 1970 | 1980 | 1990 | |
| Population Density (Persons per Square Mile) | 73.19 | 112.95 | 88.60 |
| Total Population | 1537 | 2372 | 2835 |
| Per Cent of Popualtion Born within Vermont | 74.68 | 73.69 | 70.30 |
| Number of Families | 417 | 637 | 782 |
| Per Cent of Population Aged 18 or Younger | 33.83 | 31.96 | 27.13 |
| Per Cent of Population Aged 18 to 64 | 57.63 | 60.07 | 63.84 |
| Per Cent of Population Aged 65 or Older | 8.52 | 7.97 | 9.07 |