Re: Er, that's actually a South Dakota/Minnesota billboard
Upper West? *What*? You sound like the kind of poseur who comes to San Francisco and starts referring to the place as "San Fran" or "Frisco".
Confusing the West with the Midwest is an extremely elementary error. I don't think "Upper West" is even a typo -- you went out of your way to capitalize "West". Midwest is one word, contains no hyphen, and there is no plausible typographical explanation for the capital "W". It is true that there is an Upper Midwest, although most residents therein (formerly including myself) would simply refer to themselves as being from the Midwest, or perhaps as being from the particular state from which they hail. Readers interested in the exact boundaries of these regions can find helpful entries on Wikipedia.