California's 40th congressional district is a congressional district in the U.S. state of California.The district is currently represented by Democrat Lucille Roybal-Allard. The district includes Downey, East Los Angeles, Commerce, Paramount, Bell, Bell Gardens, Bellflower, Cudahy, Huntington Park, Maywood, and the neighborhoods of Florence, Florence-Graham, Historic South Central and South Park, in South Los Angeles. It is the most Latino district in the nation, at 86.5%.