What about under 100,000 for Dems?
Surely it's not just ski country.
Here's what I got:
Closeup of Virginia:
Honestly not as many as I expected. Unsurprisingly, most fall into the categories Roll Roons came up with. The independent cities of Virginia are well represented, which makes sense. Also difficult to see are Broomfield County, CO; Bristol County, RI; Newport County, RI; and San Juan County, WA.
Atlas doesn't have county-equivalent data for Alaska, but I'm sure some Native-majority census areas would make the cut.
EDIT: Can anybody see the images? Since I can't, here's the bare links, they seem to work:
Whole country:
https://imgur.com/a/xqKAqf1Virginia closeup:
https://imgur.com/a/FL6Y7MC