Within the UK and Ireland, the surname Mcmullen most frequently occurs in Ireland where it is carried by 1 in 6,980 people. The majority of those with the family name of Mcmullen are to be found living in/around Ulster and Leinster. The name can also be found in Scotland with 1 in 54,848 people using it, and England with 1 in 82,082.
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