| Colchester - Population Change | FIPS Code=07025 |
| Absolute Population Change, 1970-1980 | 3853 |
| Per Cent Population Change, 1970-1980 | 43.90 |
| Absolute Population Change, 1980-1990 | 2102 |
| Per Cent Population Change, 1980-1990 | 16.64 |
| Population Estimate, 1996 | 16696 |
| Population Estimate, 2000 | 17638 |
| Population Estimate, 2005 | 18948 |
| Population Estimate, 2010 | 19870 |
| Population Estimate, 2015 | 20892 |
| Absolute Population Change, 1990-1996 | 1965 |
| Per Cent Population Change, 1990-1996 | 13.34 |
| Absolute Population Change, 1996-2005 | 2252 |
| Per Cent Population Change, 1996-2005 | 13.49 |
| Absolute Population Change, 2005-2015 | 1944 |
| Per Cent Population Change, 2005-2015 | 10.26 |