Pico Rivera, Diamond Bar, La Mirada, Walnut, and Santa Fe Springs, as well as the census-designated place Hacienda Heights. Cities & CDP with 10,000 or more people Los Angeles - 3,898,747 Norwalk - 102,773 Whittier - 87,306 Montebello - 62,640 Pico Rivera - 62,088 La Habra - 60,513 Hacienda Heights - 55,386 Diamond Bar - 55,072 La Mirada - 48,008 Walnut - 28,430 Santa Fe Springs - 19,219 List of members representing the district Election results 1962 1964 1966 1968 1970 1972 1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020 2022 Historical district boundaries From 2003 through 2013, the district consisted of most of the San Gabriel Valley in Los Angeles County. Due to redistricting after the 2010 United States Census, the district has moved east and south east in Los Angeles County and includes much of the previous areas as well as Bellflower and Artesia. See also List of United States congressional districts References External links GovTrack.us: California's 38th congressional district RAND California Election Returns: District Definitions California Voter Foundation map - CD38 38 Government of Los Angeles County, California Government in Orange County, California Artesia, California Avocado Heights, California Bellflower, California Cerritos, California La Palma, California Lakewood, California Montebello, California Norwalk, California Pico Rivera, California Rosemead, California Santa Fe Springs, California Whittier, California Constituencies established in 1963 1963 establishments in California