Avondale is a city in Maricopa County, Arizona, United States, adjacent to Phoenix, Arizona. According to the 2010 census, the population of the city is 76,238. According to the United States Census Bureau, the city has a total area of 41.3 square miles (107 km2), of which, 41.3 square miles (107 km2) of it is land and 0.1 square miles (0.26 km2) of it (0.15%) is water.
Avondale, incorporated in 1946, experienced rapid residential and commercial growth in the years since 1980. Once primarily a sparsely populated farming community with many acres of alfalfa and cotton fields, Avondale has transformed into a major bedroom suburb for Phoenix. Several major residential subdivisions and shopping centers have recently been built on former farmland, many adjacent to Interstate 10.