Within the UK and Ireland, the surname Coster most frequently occurs in England where it is carried by 1 in 37,048 people. The majority of those with the family name of Coster are to be found living in/around Greater London (approx. 24% of all UK Coster's), Essex and Kent. The name can also be found in Ireland with just 1 in every 138,000 people using it.
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