East Coaster
/ˌiːs(t) ˈkəʊstə/noun
A person who lives on or comes from the east coast; especially (a) NZ a native or inhabitant of the eastern or north-eastern coast of the North Island of New Zealand; (b) a native or inhabitant of the east coast of the United States, especially the north-eastern states.
Origin
Mid 19th century; earliest use found in The Caledonian Mercury. From East Coast + -er.