It includes the city of San Fernando, as well as the Los Angeles communities of Van Nuys, Pacoima, Arleta, Panorama City, Sylmar, and parts of Sun Valley and North Hollywood.

The 29th and 27th are partitioned by Angeles National Forest, Soledad Canyon Road, Southern Pacific Railroad, Sand Canyon Road, Little Tujunga Canyon Road, Santa Clara Truck Trail, Veterans Memorial Park, Golden State Freeway, Devonshire Street, Blue Creek, Chatsworth Street, Balboa Boulevard, Kingsbury Street, Genesta Avenue, Aliso Canyon Wash, and Ronald Reagan Freeway.

The 27th district takes in the city of San Fernando and the Los Angeles neighborhoods of Van Nuys, Panorama City, Sylmar, Valley Village, Sun Valley, Pacoima, Toluca Lake, Valley Glen, Arleta, Mission Hills, part of Lake View Terrace, westside North Hollywood, and central Lake Balboa.

1952 • 1954 • 1956 • 1958 • 1960 • 1962 • 1964 • 1966 • 1968 • 1970 • 1972 • 1974 • 1976 • 1978 • 1980 • 1982 • 1984 • 1986 • 1988 • 1990 • 1992 • 1994 • 1996 • 1998 • 2000 • 2002 • 2004 • 2006 • 2010 • 2012 • 2014 • 2016 • 2018 • 2020 • 2022 From 2003 to 2013, the district consisted of parts of northern Los Angeles, including Burbank, Glendale and Pasadena.

Due to redistricting after the 2010 United States census, the district shifted northwest within Los Angeles County and includes the northern San Fernando Valley.