I got 35.
I forgot: Arizona, Delaware, Georgia, Idaho, Maine,
Maryland, Montana, Nebraska, Nevada, New Hampshire,
Oklahoma, Pennsylvania, Vermont, West Virginia, Wyoming
Can't believe I forgot some of those. I suck.
I got: Alabama, Alaska, Arkansas, California, Colorado,
Connecticut, Florida, Hawaii, Illinois, Indiana,
Iowa, Kansas, Kentucky, Louisiana, Massachusetts,
Michigan, Minnesota, Mississippi, Missouri, New Jersey,
New Mexico, New York, North Carolina, North Dakota, Ohio,
Oregon, Rhode Island, South Carolina, South Dakota, Tennessee,
Texas, Utah, Virginia, Washington, Wisconsin
Still, as the Tanx says, not bad for a limey. Still, I reckon I would've gotten them all when I was a geeky 12 year old, obsessed with maps... I used to while away the hours flicking through an atlas...
OK, UK types - can you name all 34 non-metropolitan counties of the UK in ten minutes? You can check against a list
here
I'm gonna give it a try.