State Route 19 (SR 19) is a state highway in the U.S. state of California, running along Lakewood Boulevard and Rosemead Boulevard in the Los Angeles area. An additional "hidden" state highway, State Route 164 (SR 164), is also signed as part of SR 19, despite having a legal description separate from Route 19. The combined route is a north–south four-to-six lane suburban roadway, lying east of the Long Beach Freeway (Interstate 710) and west of the San Gabriel River Freeway (Interstate 605), and connecting the eastern parts of Long Beach and Pasadena via the Whittier Narrows. Under their legal descriptions, SR 19 runs north to Gallatin Road in Pico Rivera, then SR 164 goes from Gallatin Road to Pasadena. Since 1998, several pieces have been relinquished to local governments, and more transfers are authorized by state law. Route description Locals generally refer to the combined SR 19/164 route as either Lakewood Boulevard or Rosemead Boulevard, not by its numerical designation. The two highways are part of the National Highway System, a network of highways that are considered essential to the country's economy, defense, and mobility by the Federal Highway Administration. The original official southern terminus of SR 19 was at the Los Alamitos Circle in Long Beach, where Lakewood Boulevard, State Route 1 (Pacific Coast Highway), and Los Coyotes Diagonal converge. SR 19 then proceeded north along Lakewood Boulevard through Long Beach and the City of Lakewood, intersecting with Interstate 405, passing under a runway of the Long Beach Airport (the part through the airport has been relocated to the east; parts of the old alignment remain as airport service roads), then running to the west of Lakewood Center Mall before passing through the neighborhood of Mayfair. Since the California Legislature relinquished segments of the highway, state control of SR 19 now officially begins at the point where Lakewood Boulevard crosses the Lakewood–Bellflower city limits at Rose Street (SR 19 in Bellflower is also planned to be relinquished by the state). SR 19 then intersects State Route 91 before straddling the city border between Bellflower and Paramount and later Bellflower and Downey. State control of SR 19 then ends north of Gardendale Street when Lakewood Boulevard fully enters into Downey. Lakewood Boulevard continues north through Downey, intersecting with Interstate 105 before passing by the large site formerly occupied by North American Aviation, Rockwell International and Boeing Reusable Space Systems