You can use this app to create a map of the counties you've been to. Use your mouse wheel (or pinch and zoom if you’re using a touch screen) to move around the map. Click a county to bring up basic information, including a little Google Map. If you’ve been there, tap it again to mark it visited.
Yellow counties are ones you’ve passed through. Green counties are ones you’ve been to several times, or spent nights in, and blue counties are ones you’ve lived in. Have fun!