I just did the sums and I think I've ridden in 27/50. Outstanding ones below, with 5 already in plans to be ridden in this year.
Alaska (AK)
Arizona (AZ) - X
Arkansas (AR)
Delaware (DE)
Florida (FL)
Hawaii (HI)
Illinois (IL)
Indiana (IN) - X
Iowa (IA)
Kansas (KS) - X
Kentucky (KY) - X
Louisiana (LA)
Maine (ME)
Maryland (MD)
Minnesota (MN)
Mississippi (MS)
Missouri (MO) - X
Nebraska (NE)
North Dakota (ND)
Oklahoma (OK)
Rhode Island (RI)
Washington (WA)
Wisconsin (WI)
Lazy list of states copied from here if you want to join in:
Alaska (AK)
Arizona (AZ) - X
Arkansas (AR)
Delaware (DE)
Florida (FL)
Hawaii (HI)
Illinois (IL)
Indiana (IN) - X
Iowa (IA)
Kansas (KS) - X
Kentucky (KY) - X
Louisiana (LA)
Maine (ME)
Maryland (MD)
Minnesota (MN)
Mississippi (MS)
Missouri (MO) - X
Nebraska (NE)
North Dakota (ND)
Oklahoma (OK)
Rhode Island (RI)
Washington (WA)
Wisconsin (WI)
Lazy list of states copied from here if you want to join in: