Rialto is a city in San Bernardino County. The population was 99,171 with the 2010 Census. Rialto is the seventh largest city in San Bernardino County, and in recent years has earned national recognition for its innovative approaches,
Rialto is home to three major regional distribution centers: Staples Inc., which serves stores across the entire West Coast of the United States, Under Armour and Target in the northern region of the city, in the Las Colinas community. One of the United States’ largest fireworks companies, Pyro Spectaculars, is also headquartered in Rialto.