From 538.com
"Indiana, Iowa and Illinois appear to be the core of the Midwest, each pulling more than 70 percent of the vote (that may partly be because of their substantial populations). Michigan, Wisconsin and Minnesota each pulled at least 60 percent of the vote, so we can probably put them in the Midwest without too much fuss. Ohio, Missouri and Kansas each got more than half.
As for the rest of the states, it seems unclear whether they're in the true Midwest.
If anything, the Midwest is as nebulous as I'd expected. Too often, people refer to vast swaths of American territory as a solid region. It's easy to break Americans into tribes such as “Midwestern,†but there are more subdivisions and diversity in these groupings than we generally acknowledge."
See entire article here with graphic map:


fart