Castletown
- Country:
- Isle of Man
- Continent:
- Europe
Castletown's 2026 population is now estimated at 3,196. In 1981, the population of Castletown was 3,141. Castletown experienced a decrease of -2 residents over the past year, marking an annual decline of -0.06%. These population values and projections come from Isle of Man towns and villages via CityPopulation and World Population Review Internal Projections .