You're right, I've never been to Alaska. The bad news is there are no counties in Alaska. The good news is that there are 18 boroughs, and yes, I'll need to catch a plane to get many of them (like the Aleutian Islands!) If I drive from Anchorage to Fairbanks and then take the tour van to Prudhoe Bay, I would get Anchorage, MatSu, Denali, Fairbanks-North Star, the unorganized borough, and North Slope. So 5 out of 18 plus the unorganized borough.