States where a county sweep for one party is likelier than the other party winning the state?

[Figueira]

Obviously Massachusetts, Rhode Island, Hawaii, West Virginia, and Oklahoma are a given.

Vermont
Connecticut
Delaware
Maryland(?)
Kentucky
Arkansas
Nebraska
North Dakota
Wyoming
Utah
Idaho

Anything I missed?

[Figueira]

Obviously Massachusetts, Rhode Island, Hawaii, West Virginia, and Oklahoma are a given.

Vermont
Connecticut
Delaware
Maryland(?)
Kentucky
Arkansas
Nebraska
North Dakota
Wyoming
Utah
Idaho

Anything I missed?

Louisiana, Alaska, Virginia, Missouri, Nevada.

A Democratic sweep of Nevada is more likely than a Republican win in the state?

Also, totally agreed on whoever said California. Democrats winning places like Plumas/Lassen/Modoc is more likely than Republicans winning the state.

[Figueira]

Maryland's only been fully swept once, by Eisenhower in 56. A Dem sweep is impossible because of Garrett County, part of the infamous school of German Unionist mid-Appalachian counties as seen in KY, TN, and WV, although a Dem sweep of every other county in the state has been done before, as by Mikulski in 92 and 98.

Yeah, Dems winning Garrett County and Rs winning Maryland are so impossible that it's hard to say which is more likely, but I think I'd go with Garrett County just because it's smaller and it's easier for a fluke to flip it. Similar stuff applies in North Dakota.