Phillips Ranch is a master-planned community, first developed by Louis Lesserin 1965. It is located in the southwestern portion of the city limits of Pomona, in Los Angeles County, California. It is located near the Pomona Freeway, the Orange Freeway, and the Chino Valley Freeway. The zip code serving the neighborhood is 91766. Phillips Ranch is 4 miles southwest of downtown Pomona, and is mostly working to upper-middle class in a generally diverse community. Many residents use "Phillips Ranch, CA" as a return address, which is an acceptable alternative to Pomona, CA, according to the United States Postal Service. Phillips Ranch is often referred to by its neighborhood name instead of by the city name.

Pomona is a city in eastern Los Angeles County, California, United States. Pomona is located in the Pomona Valley, between the Inland Empire and the San Gabriel Valley. At the 2020 census, the city's population was 151,713. The main campus of California State Polytechnic University, Pomona, also known as Cal Poly Pomona, lies partially within Pomona's city limits, with the rest being located in the neighboring unincorporated community of Ramona.