California’s 25th congressional district straddles Orange County, Los Angeles County, and San Bernardino County, and includes the cities of Brea, Rowland Heights, Placentia, Diamond Bar, Yorba Linda, Fullerton, La Habra, La Habra Heights, Chino Hills, Walnut, Anaheim, Industry, Hacienda Heights, Chino, and Buena Park.
Race: 55.1% white, 28.3% Asian, and 2.4% black. Ethnicity: 34.6% Hispanic.
The district is currently represented by Republican Ed Royce. This is his third term representing the current CA 39. He previously represented CA-40 and the former CA-39. In January, 2018, Royce announced his retirement from Congress.
“Know Before You Go” political background information on D39 is available here.