I had not seen this thread before...I have established a "life time" goal of riding a METRIC century in each state...not the full...not quite willing to jump all over the big ones! I also, kind of, established a few "rules" for my quest...
(1) It must be at least 60 miles (yes, a bit short of 100K, but...it makes it a bit easier with the varying readouts of GPS, Strava, organizer, etc).
(2) It must be an organized event...not just me saying I rode 60+ miles
(3) It must provide a tshirt or jersey as part of the event (documentation of the event)...yes, sounds cheesy, but my wife cuts the shirts up and makes me a quilt...
(4) The state is counted where the ride originates (i.e. Rhode Island! Some of the miles for RI were in Mass, but the ride originated in RI)
I have done ten states...
North Carolina
South Carolina
Georgia
Alabama
Florida
New Hampshire
Massachusetts
Rhode Island
Maine
Connecticut