It's on the front page of cte.battlelog
They have a blue news header "PLEASE HELP US DICTATE WHERE TO SETUP NEW SERVERS - VOTE IN THE POLL! " and the poll is a bit lower down on the right side of the page.
The link above won't properly work for many, though, because the person clicking the link would have to be signed in to cte.battlelog. If they're not then you just get the "Log In - Sign Up" page.
The voting options aren't city specific, though. They're global. Europe, N.A. west coast, N.A. east coast, South America, Aust., Asia, Africa.
Edited by SkrooLoose - 5/16/14 at 8:30am