Who necromanced this 2 year old thread! Anyway, I'm no Iotero -thank the Flying Spaghetti Monster- but I can lend some support to the 140 million figure. First, Wiki says that of July 1, 2017 the US population was 325,350,377. source Second, Wiki says in their page on Young Earth Creationism:
Lastly, my calculator tells me that 38% of 325,350,377 is 123,633,143 people. So, not 140 million, but still a considerable, if not worrying, number. Whether these folks would label themselves YECs would be fodder for another poll.