16.3 million people
Located around the major cities of the Northeast and the Midwest, these 77 counties have not changed as quickly as the semi-urban paces around them. They have been slower to urbanize and at 87% white, they are slightly less diverse than the Urban Suburbs and the Exurbs. They are also less wealthy, with a median household income of about $50,000, and they feature lower education levels – about 23% of the population has at least a bachelor’s degree. The presidential vote in them is generally close. The Middle Suburbs vote went to Barack Obama in 2008, but in 2012 Republican Mitt took back for the GOP, winning them by two percentage points, 50% – 48%.