Alaska Air Group, based in Seattle, made the list. So did UPS, BP, Costco and AT&T, along with several national retail businesses that have stores in Alaska. No Alaska-based companies participate in the annual HRC rating.

The list of 305 Best Places to Work was released on Monday and contains only businesses that scored 100% in HRC’s 2010 Corporate Equality Index.

“These companies’ actions constitute tangible, significant civil rights progress,” HRC president Joe Solmonese said in a statement. “By mandating equal opportunity in hiring, ensuring equal compensation through medical and family benefits, and promoting informed work forces and equal work places, these companies light the way for advances in state and federal law.”

The 305 Best Places, and the full 2010 Index ratings, are posted HERE.