The United States was the most popular country Britons moved to last year, according to a Royal Mail study of redirected post.
The USA came top of a list after Royal Mail analysed more than 20,000 international redirection applications from the last 12 months.
Nearly a fifth of all redirected mail went to the US, with a sixth travelling to France, 10% to Australia, 8% to Spain and 6% to the Republic of Ireland.
Jim Conning, managing director of Data Services at Royal Mail, said: "According to the latest ONS figures, more than 323,000 people left the UK last year to set up home abroad. It is clear that as a nation we are happy to pack our bags and move abroad.
"Making sure your mail comes with you may be a small part of the to-do list but it can be one of the most important, especially if you want your personal details to arrive safely at your new home."
Senegal (0.03%), Andorra (0.02%) and Corsica (0.01%) also featured in the study.