| Derby - Population Change | FIPS Code=19035 |
| Absolute Population Change, 1970-1980 | 970 |
| Per Cent Population Change, 1970-1980 | 29.83 |
| Absolute Population Change, 1980-1990 | 257 |
| Per Cent Population Change, 1980-1990 | 6.09 |
| Population Estimate, 1996 | 4696 |
| Population Estimate, 2000 | 4717 |
| Population Estimate, 2005 | 4751 |
| Population Estimate, 2010 | 4761 |
| Population Estimate, 2015 | 4769 |
| Absolute Population Change, 1990-1996 | 217 |
| Per Cent Population Change, 1990-1996 | 4.84 |
| Absolute Population Change, 1996-2005 | 55 |
| Per Cent Population Change, 1996-2005 | 1.17 |
| Absolute Population Change, 2005-2015 | 18 |
| Per Cent Population Change, 2005-2015 | 0.38 |