| Castleton - Population Change | FIPS Code=21015 |
| Absolute Population Change, 1970-1980 | 800 |
| Per Cent Population Change, 1970-1980 | 28.20 |
| Absolute Population Change, 1980-1990 | 641 |
| Per Cent Population Change, 1980-1990 | 17.62 |
| Population Estimate, 1996 | 4289 |
| Population Estimate, 2000 | 4933 |
| Population Estimate, 2005 | 5201 |
| Population Estimate, 2010 | 5475 |
| Population Estimate, 2015 | 5694 |
| Absolute Population Change, 1990-1996 | #REF! |
| Per Cent Population Change, 1990-1996 | 0.26 |
| Absolute Population Change, 1996-2005 | 912 |
| Per Cent Population Change, 1996-2005 | 21.26 |
| Absolute Population Change, 2005-2015 | 493 |
| Per Cent Population Change, 2005-2015 | 9.48 |