Was pretty proud to get 17 just by guessing common and/or presidents' last names, without knowing a name of even one actual county. Sadly, still not enough to get a point...
The power of educated guessing incarnate. I got 32 this time, but can see from previous tries I've guessed 15 others correctly before, so theoretically I could have over half correct just by guessing plus some small knowledge of places I've driven through (Lake Michigan area).