The first listing, Sandusky, Ohio, gives the articles sources.
Michigan, Ohio, Indiana seem to dominate -- haven't checked the geography, but mebbe all close to mfr'g towns? Elkhart, Indiana f'sure. But Cumberland, Md-W. Va (not dat far from me) was a bit of a surprise -- altho anything with W. Va. could explain "cheap".
I thought Tennessee might be in there (TVA), and KY, but apparently lots of retirees are flocking there, running up prices. And with smaller mosquitoes than in Florida....
Note the relatively high crime rate in Fairbanks, about 6x Elkhart, Ind. Most in the middle.
And the other Q is, Are these place also good for a bidniss?? Food fer thought.