Jefferson Park is a neighborhood in the South Los Angeles region of the City of Los Angeles, California. Located within the West Adams district, there are fourteen Los Angeles Historic-Cultural Monuments in the neighborhood, and in 1987, the 1923 Spanish Colonial Revival Jefferson Branch Library was added to the National Register of Historic Places…Jefferson Park is a neighborhood in the South Los Angeles region of the City of Los Angeles, California. Located within the West Adams district, there are fourteen Los Angeles Historic-Cultural Monuments in the neighborhood, and in 1987, the 1923 Spanish Colonial Revival Jefferson Branch Library was added to the National Register of Historic Places. A portion of the neighborhood is a designated Historic Preservation Overlay Zone.