There is one place named Mercury Island in Canada.
All places in the world called "Mercury Island".
Wellington (4)
Windsor (4)
Victoria (3)
Kingston (3)
Havelock (3)
Sidney (3)
Centreville (3)
Princeton (3)
Borden (3)
Westport (3)
Milton (3)
Richmond (3)
Benton (3)
Saint Andrews (3)
Selkirk (3)
Tracadie (3)
Radisson (2)
Saint Louis (2)
Stanley (2)
Waterloo (2)
Alma (2)
Boundary (2)
Chipman (2)
Durham (2)
Grand Falls (2)
Laflèche (2)
Morden (2)
Rosedale (2)
Seaforth (2)
Tiverton (2)