Those 10,000+ finishers include participants in the marathon, half-marathon, 5K and wheelchair and other events. It looks like 643 runners completed the 5k. ... There's something I don't get about the results page, though, because it consistently says 643 finishers but the last set of results lists finish orders up to 1523. What am I missing?
You're right about the numbers. I hadn't been able to find just the 5K results when I wrote the 10000+ number, which is what came up on the active.com site. Clicking on the link to the finishers, it then allows sorting by event. 5K run/walk sorting shows 1526 finishers:
Maybe 643 were entered as runners, and the rest were walkers.