A group called the Bay Area Center for Voting Research has released a study ranking what it calls the most conservative and most liberal cities in the U.S. of A. The list is based on the "political leanings" of the various burgs.
Topping the most liberal list: Detroit (shed a tear for the GOP-voting Motor City Madman, Ted Nugent); Gary, Indiana; Berkeley, California; Washington, D.C.; and Oakland, California.
Striding atop the conservative list: Provo, Utah; Lubbock, Texas; Abilene, Texas; Hialeah, Florida; and Plano, Texas (routinely a backround for those unconvincing "heroin is killing our rich young kids" stories).
More cities and info here.