Rowland Heights is a relatively affluent unincorporated area and census designated place of 13.1 square miles (34 km2), located in and below the Puente Hills in the San Gabriel Valley, in Los Angeles County, California and borders Orange County. The population of the census designated place (CDP) was 48,993 at the 2010 census. Rowland Heights is dependent upon representation from the County of Los Angeles (County Board of Supervisors). Rowland Heights is the largest census designated place in Los Angeles County by area and the county's fourth largest CDP by population. Rowland Heights sits in the 39th Congressional District, which is considered to be a Republican stronghold due to the large number of business owners and other high-net-worth individuals.
Spering's Best Places ranks Rowland Heights, Los Angeles County, California at #2 in "Most Comfortable Summer Cities." Rowland Heights has an average household income at one of the top-earning percentiles in the country at $99,354, while the median household income is $83,606; compared to Los Angeles, where the average household income is $81,225, and the median household income is $56,993. Rowland Heights is primarily residential with several shopping centers and restaurants.
A number of corporations, particularly in the technology and import/export businesses, are located in neighboring City of Industry. Many business owners and employees, therefore, reside in Rowland Heights as well as Hacienda Heights, and Walnut due to the close vicinity.