Mesa is a city in Maricopa County, in the U.S. state of Arizona, and is a suburb located about 20 miles (32 km) east of Phoenix. It is the central city of 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. Mesa is the third-largest city in Arizona, after Phoenix and Tucson, and the 38th-largest city in the US. The city is home to 439,041 people as of 2010 according to the Census Bureau. Mesa is home to numerous higher education facilities including the Polytechnic campus of Arizona State University.