Pomona is a city in Los Angeles County, California, at the western edge of the Pomona Valley branch of the Inland Empire region since nearly the entire city is physically located east of the San JoseSan Bernardino County border is used as the dividing line between the San Gabriel Valley and the Inland Empire. As of the 2000 census, the city population was 149,473. In 2005, its population was estimated as 160,815. Pomona is the 5th largest city in Los Angeles County. Pomona apartments for rent comparison page shows most up to date rent information on Pomona apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.