There is one place named Extension in Canada.
All places in the world called "Extension".
Wellington (4)
Windsor (4)
Borden (3)
Princeton (3)
Westport (3)
Milton (3)
Richmond (3)
Benton (3)
Saint Andrews (3)
Selkirk (3)
Tracadie (3)
Kingston (3)
Victoria (3)
Havelock (3)
Centreville (3)
Sidney (3)
Alexandria (2)
Chesterville (2)
Drinkwater (2)
Grand Beach (2)
Kitchener (2)
Montague (2)
Saint-Laurent (2)
Southampton (2)
Wallace (2)
Beaver (2)
Cambridge (2)
Cornwall (2)
Enterprise (2)
Hebron (2)