Latest figures from ONS show that in the year ending June 2015 the inflow of people to Cornwall of 21,459 was greater than the outflow of 16,954. Leading to an increase of 4,505. Cornwall had the dubious distinction of having the highest surplus of any local authority in England and Wales.
NB Internal migration is defined as residential moves between different local authorities (LAs) in the UK, including those that cross the boundaries between the four UK nations: England, Wales, Scotland and Northern Ireland. However, only moves affecting LAs in England and Wales are included; moves that occur solely within Scotland and/or Northern Ireland are excluded. The statistics also exclude any moves within a single LA and any international moves either into or out of the UK