California's 27th congressional district is a congressional district in the U.S. state of California.

The district is currently represented by Democrat George T. Whitesides.

The district includes most of northern Los Angeles County, including the cities of Santa Clarita, Palmdale, and Lancaster, and parts of the northwestern San Fernando Valley in the city of Los Angeles.

[3] Prior to redistricting in 2022, the district was located in the San Gabriel Valley.

It encompasses most of northern Los Angeles County, including the cities of Santa Clarita, Lancaster, and Palmdale; the census-designated places Stevenson Ranch, Val Verde, Hasley Canyon, Castaic, Lake Hughes, Elizabeth Lake, Green Valley, Agua Dulce, Acton, Leona Valley, Quartz Hill, Desert View Highlands, Littlerock, and Sun Village; the neighborhoods of Porter Ranch and Granada Hills in the city of Los Angeles, along with the Sierra Pelona Mountains and the northern slopes of the San Gabriel Mountains.