This is a funny question for me. I was raised in NYC/LI and from our view, Ohio was considered the mid west. My wife, raised in Cincinnati, always gets irked when I say Ohio's in the Midwest..."it's in the east you knucklehead! she says.
So I guess it's a matter of perspective and it's the fault of our sports leagues that we say Ohio (west and central division teams) is in the mid west. Still an issue in my house...I just don't bring it up anymore...shhh, she's coming in the room...gotta go!