Mesa (pron.: /ËmÉsÉ/ MES-É) 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. 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 Arizona's center of population.