City of Pomona Pomona is the seventh largest city in Los Angeles County, California. Pomona is located in between the Inland Empire and the San Gabriel Valley. As of the 2010 census, the city population was 149,058. 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. The city also hosts the Pomona Swap Meet and Classic Car Show is considered by many to be a Southern California classic. It is one of seven major events hosted at the Fairplex each year. It's also home of Cal Poly Pomona, a polytechnic university in the city's western edge. Since the 1980s, Pomona's newest neighborhood Phillips Ranch, experienced rapid growth with homes still being built in the hilly area between Downtown and Diamond Bar. Today, Phillips Ranch is nearly all residential. Northern Pomona has seen some gentrification with additional housing units added and revamped streetscapes.