Omaha might qualify. Most cities however have slipped away from that status one by one. I suppose Marion County might be another (the city and county merged to keep it Pub about 3 decades ago, but time marches on). Perhaps the city of Phoenix as well.
Meh, Marion went hard for Obama in 2008. I suppose you could call it one, though Obama will likely carry it big again in 2012 thanks to large black turnout. Most suburbs though are outside of the county, though. Beech Grove is in, as are a couple others, but many are out.