Conversely, is there a list of the most sparsely populated/rural counties that are Democratic? I realize it could be a lot more time consuming, but many rural counties don't vote Democratic.
There'll be a considerable number, actually. Southern black belt, western hispanic and/or Native American majorities. Native American counties in the midwest, a number of traditionally Democratic counties in the upper Midwest (primarily Wi, IA and MN, plus a couple in the UP), Hawaiian counties other than Oahu, plus a number of mostly western ski resort counties.
