Pomona is the fifth largest city in Los Angeles County, California (after Los Angeles, Long Beach, Glendale, and Santa Clarita). Pomona is located in between the Inland Empire and the San Gabriel Valley. As of the 2000 census, the city population was 149,473. In 2005, its population was estimated as 160,815.

The city is the site of the Fairplex, which hosts the L.A. County Fair and the NHRA Auto Club Raceway at Pomona, (formerly known as Pomona Raceway) Powerade Winternationals Drag Racing competition.