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Castletown yw cyn brifddinas Ynys Manaw.
Gall Castletown gyfeirio hefyd at:
- Yr Alban
- Iwerddon
- Castletown, Swydd Corc, Castletownroche
- Castletown, Swydd Laois
- Castletownbere, Swydd Kerry
- Castletown-Geoghegan, Swydd Westmeath
- Castletown, Swydd Wexford, County Wexford
- Lloegr
- Castletown, Portland, Dorset
- Castletown, Tyne a Wear
- Castletown, Penrith, Cumbria