Exact spelling required. You can view the list of counties you've named so far after you've named at least 3 of them. Clicking on the name of the county will highlight it on the map.
My name is Sean "Matt Mangels" Hall and I put this together in May 2024. The map is courtesy of Wikipedia user awmcphee. If you liked this, check out Chris Arvin's game that challenges you to name every street in San Francisco, if you haven't already. It partially inspired me to make this game.