Great idea for a quiz. Perhaps be clear that largest refers to area, and whether area includes only land area (or both inland water and land). For WA, Clark is not the largest county. Also, for ND, there is no Dare County in that state. And, for LA, there are sources that list another parish as the largest. Thank you!
Challenging quiz. I know a lot of populous counties, but the big ones are often big and unpopulated. Went from getting 10 to 33.