8.5 million people
Rural, 94% white and lower income ($38,300 median income), many of these 337 counties are based in the region commonly referred to as Appalachia, but their footprint extends beyond there into Upper Midwest, the South and even the Northwest states. They are among the least diverse places in the United States, only 2.5% African American and 4% Hispanic. They are also very reliably Republican in presidential races. Since 2000, no Republican candidate for president has gotten less than 57% of the vote from Working Class Country counties.