I found this site on Minnesota Mom's blog. She posted about it ages ago but I must have missed that post.
I tried it out and got an 92% with an average error of 12 miles. Some of them are pretty tricky if you get a middle state early on. It was fun and I am going to have my kids try it out and see how well they know their geography.
Let me know how you did when you comment. Good Luck!