I haven't regularly read the comics for a number of years, but when I did, Metropolis was always on the east coast.
This page has a map from a DC role-playing game that came out in 1990:
http://ifanboy.com/articles/the-secr...eally-big-map/
It has Gotham in Southern New Jersey, near where Atlantic City is. Metropolis is in Delaware. NYC exists as a real place in the DCU. This geography would work in the DC movie universe if Gotham and Metropolis were on opposite sides of the Delaware Bay.
In the Smallville tv show, they made Metropolis somewhere in the midwest so it was closer to Smallville when Clark and his friends got older and started moving away. This is the only continuity I know of where Metropolis wasn't on the east coast.