 By 1990, the city's population had grown to 28,743, by 2000, it reached 34,733, and by 2010, it was 44,894.A report released by the U.S. Census Bureau in May, 2013, stated that San Marcos had the highest rate of growth among all U.S. cities and towns with at least 50,000 people.Its population rose 6.9% between 2011 and 2012.