Within the UK and Ireland, the surname Castleton most frequently occurs in England where it is carried by 1 in 77,320 people. The majority of those with the family name of Castleton are to be found living in/around Norfolk (approx. 15% of all UK Castleton's), Greater London and Suffolk. The name can also be found in Ireland with just 1 in every 371,538 people using it.
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