In 2011, a record number of 21,250 people registered for the St. Louis Rock and Roll Marathon and Half Marathon, with entrants from all 50 states and 25 countries.
2011 Finishers:
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3,354 full marathon
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14,511 half marathon.
I’ve finished 4 half marathons. Those races had roughly between 3,000 and 10,000 runners.
This race by far will be the largest. What is it like to run with 20,000 people? Probably not much different than running with the 10,000.
The number that bothers me more, is the slim 19% that finished the full marathon as opposed to the half. =o
Running for Life 
I had no idea that that many aren’t able to finish the race. That’s one out of every 5. Anne you are definitely the one out of 5. With your drive, determination and indomitable spirit you will complete it. Take it from someone whose known you all your life!
Hi Dolores, Sorry, I did a poor job of explaining the numbers. There are about 4,000 that registered and did cross finish line for whatever reason (some of the 4,000 probably didn’t even make it to the race). In 2011, for every 5 running the half, there was only 1 running the full marathon. If you apply that trend to those that didn’t finish or show up, 800 of the 4,000 were probably running full marathon and 3,200 of the 4,000, the half.
Thanks for your comment/compliment though – I’ll take it either way. Always appreciate your support.