Question: what are the largest marathons in the us?
Answer: Chevron Houston Marathon. Carlos Alvarez / E+ / Getty Images. ... , Los Angeles Marathon. Harry How / Getty Images Sport. ... , Boston Marathon. Getty Images. ... , Medtronic Twin Cities Marathon. WireImage / Getty Images. ... , Portland Marathon. ... , Bank of America Chicago Marathon. ... , Detroit Free Press/Talmer Bank Marathon. ... , Marine Corps Marathon.