Mesa ) is a city in Maricopa County, in the U.S. state of Arizona and is a suburb located about 20 mi east of Phoenix. Mesa is in the East Valley section of the Phoenix Metropolitan Area. It is bordered by Tempe on the west, the Salt River Pima-Maricopa Indian Community on the north, Chandler and Gilbert on the south, and Apache Junction on the east. As of the 2010 Census Mesa became the Arizona Center of Population,.Mesa is the third-largest city in Arizona, after Phoenix and Tucson, the 37th-largest city and largest suburb in the US. Despite being home to 439,041 as of 2010, reported by the Census Bureau, making its population larger than more recognizable cities such as Miami, Minneapolis, St. Louis, and Cleveland, Mesa is decidedly a bedroom community. Mesa is home to the Polytechnic campus of Arizona State University.