| Hartland Town - Population Change | FIPS Code=27045 |
| Absolute Population Change, 1970-1980 | 590 |
| Per Cent Population Change, 1970-1980 | 32.67 |
| Absolute Population Change, 1980-1990 | 592 |
| Per Cent Population Change, 1980-1990 | 24.71 |
| Population Estimate, 1996 | 3118 |
| Population Estimate, 2000 | 3485 |
| Population Estimate, 2005 | 3704 |
| Population Estimate, 2010 | 3922 |
| Population Estimate, 2015 | 4136 |
| Absolute Population Change, 1990-1996 | 130 |
| Per Cent Population Change, 1990-1996 | 4.35 |
| Absolute Population Change, 1996-2005 | 586 |
| Per Cent Population Change, 1996-2005 | 18.79 |
| Absolute Population Change, 2005-2015 | 432 |
| Per Cent Population Change, 2005-2015 | 11.66 |