Pomonais a city in Los Angeles County, United States, California. Pomona is located in the Pomona Valley, between the San Gabriel Valley and the Inland Empire. The population of the town is over 145,000. California State Polytechnic University's main campus, Pomona, also known as Cal Poly Pomona or simply Cal Poly, sits entirely within the city limits of Pomona. There are several campus areas in San Dimas and Walnut, too. It has a total land area of 22,964 square miles.