Norwalk is a city in Los Angeles County, California, United States. The population was 102,773 at the 2020 census. Founded in the late 19th century, Norwalk was incorporated as a city in 1957. It is located 17 miles southeast of downtown Los Angeles and is part of the Greater Los Angeles area. Norwalk is a member of the Gateway Cities Council of Governments. Norwalk's sister cities are Morelia in the Mexican state of Michoacán, and Hermosillo, in the Mexican state of Sonora.