The district is currently represented by Democrat Pete Aguilar.

From January 3, 2023, following the 2020 redistricting cycle, the district centered on San Bernardino.

The district takes up a part of southwestern San Bernardino County.

The 33rd district takes in most of San Bernardino, northern Redlands, Bloomington, western Highland, most of Colton, Grand Terrace, Rialto, Fontana, central Rancho Cucamonga, and a small portion of Loma Linda, as well as the census-designated places Bloomington, Muscoy, and western Mentone.

1962 • 1964 • 1966 • 1968 • 1970 • 1972 • 1974 • 1976 • 1978 • 1980 • 1982 • 1984 • 1986 • 1988 • 1990 • 1992 • 1994 • 1996 • 1998 • 2000 • 2002 • 2004 • 2006 • 2008 • 2010 • 2012 • 2014 • 2016 • 2018 • 2020 • 2022 From 2003 to 2013, the district encompassed the incorporated city of Culver City (a center of film and TV production), and in the Baldwin Hills unincorporated areas such as Ladera Heights, and some of the western neighborhoods within the city of Los Angeles such as Baldwin Hills (neighborhood).