Running USA has released their statistics on the Largest Running Events for the year of 2010. This is part of their State of the Sport Series, which also includes Runner Profiles, the results of their Runner Survey, and breakdowns by race distance. Fascinating stuff.
In the Largest running events category, though, they have a place to break it down by state. For our lovely state of Nevada, the top 4 were in Las Vegas, and the next 4 in size were in the Reno area. They were:
1. Zappos.com Rock 'n' Roll Las Vegas Marathon/Half Marathon
2. Race for the Cure: Las Vegas Festiva/5K
3. Ragnar Relay Las Vegas 195 Mile
4. Great Santa Run 5K
5. Race for the Cure: Reno Festival/5K
6. Reno-Tahoe Odyssey Relay 178 Mile
7. Reno's Rock-n-River Marathon/Half Marathon/10K
8. Moms On The Run 5K/10K
Check out all the statistics at the links above. But good showing, Reno area!