A colleague sent this interesting link today - check out these maps of the geographic distribution of obesity and diabetes in the US. You can see how the distribution has changed over time at the state level of resolution; you can also see how distributions vary at the county level within states, as well as across racial/ethnic categories.
It looks like Milwaukee County has higher levels than the state of Wisconsin as a whole. But some of these data are puzzling... why do the numbers seem to drop so quickly when you cross the state line from Nebraska to Colorado, or Illinois to Missouri?