OneAmerica 500 Festival Mini-Marathon 13.1M Indianapolis, IN-> http://www.500festival.com/marathon/
The OneAmerica 500 Festival Mini-Marathon, which takes place in Indianapolis, Indiana, is the largest half-marathon in the United States

The 35th Running of the OneAmerica 500 Festival Mini-Marathon takes place on Saturday, May 7, 2011. The Mini has sold-out for the past nine years with 35,000 registrants, and an additional 4,000 participants in the Finish Line 500 Festival 5K. The Mini-Marathon is the largest half-marathon in the U.S., and overall, the largest running event in America.

The Mini-Marathon began in 1977 and became an official 500 Festival event in 1979. The 500 Festival, a not-for-profit volunteer organization, was created in 1957 to organize civic events celebrating the Indianapolis 500-Mile Race. Over the past 51 years, the 500 Festival has grown to become one of the largest festivals in the nation. The Mini-Marathon is one of the first events of the month-long celebration, running the day before IndyCar Series practice opens at the Indianapolis Motor Speedway. read more-> http://en.wikipedia.org/wiki/OneAmerica_500_Festival_Mini-Marathon

Certified Course 500 Festival Mini-Marathon Indianapolis, IN