This map is a little... off to me.

I went ahead to their source to see what kind of numbers they were using, and I'll chime in on New Jersey.

They used $285,000 as the median sales price for NJ, and I don't think I've ever seen a house go for that cheap.

Paramus, NJ ($399K is an empty lot)

East Hanover, NJ ($299K is an empty lot)

NJ also has really high property taxes, and a $300,000 home would probably include a property tax bill of $500+ a month.