COLORADO SPRINGS, Colo. – (March 16, 2011) – Despite the lingering recession, “marathon mania” continued in the U.S. with another record year of growth as U.S. marathons in 2010 had an estimated 507,000 finishers, an 8.6% increase from 2009, the second largest increase in the past 25 years (U.S. marathons grew 9.9% in 2009). Last year, across the country, the majority of large marathons reported sold-out or record fields, and 2011 looks to continue this growth trend as the following U.S. marathons have sold-out in record time: Boston (8 hours!), Marine Corps (28 hours) and Bank of America Chicago (31 days), while other marathons such as Chevron Houston, Big Sur, LIVESTRONG Austin and Cowtown also filled their fields.
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http://www.runningusa.org/node/76115