Green County, WI

[TJ in Oregon]

Because it's close to Madison. So there's a lot of University of Wisconsin students and state employees.

Half right, it is close to Madison and close enough to have some commuter/Madison cultural spillover, albeit virtually no students are commuting from Green County to the University of Wisconsin.

But, as an example of the Madison spillover driving the results, here is the 2016 county map:



Hillary mostly just won the areas bordering Dane County (along with incorporated areas).

[TJ in Oregon]

Iowa county is much more democratic and pretty much immune to TRUMP rural trends in southwestern Wisconsin.

Iowa County has a similar town map, also showing the liberal areas are those adjacent to Dane:



While Green County has a little bit of an upscale boutique culture of Madisonians looking for rural respite, Iowa County has it to a much greater extent. Iowa County also has a more Nords than Green County and would probably have a higher Democratic floor even without Madison.

Even with all of that, Iowa County trended strongly towards Trump:



It's not impervious to the SW trends, it just was way more Democratic to begin with.

Heck, even rural Dane trended toward Trump!