California's 23rd State Senate district
Current senator	Suzette Martinez Valladares R–Santa Clarita
Population (2020)  • Voting age  • Citizen voting age	1,033,749[1] 681,524[1] 622,618[1]
Demographics	45.5% White 10.8% Black 37.9% Latino 5.8% Asian 0% Native American 0% Hawaiian/Pacific Islander 0% other 0% remainder of multiracial
Registered voters	561,146[2]
Registration	40.44% Democratic 29.97% Republican 21.07% No party preference

California's 23rd senatorial district is one of 40 California State Senate districts. It is currently represented by Republican Suzette Martinez Valladares of Santa Clarita.

For and after the 2024 California State Senate election, the district will encompass the high desert communities of the Antelope Valley and Victor Valley, as well as the Santa Clarita Valley in Los Angeles County. The district has a very large Latino population.

Years		Seat A				Seat B			Counties represented
		Senator	Party	Electoral history		Member	Party	Electoral history
District established January 6, 1862
January 6, 1862 – December 7, 1863		Lewis Cunningham (Marysville)	Union	Elected in 1862. Re-elected in 1863. Re-elected in 1865. [data missing]		William H. Parks (Marysville)	Union	Elected in 1862. [data missing]	Yuba
December 7, 1863 – December 4, 1865						Charles S. Haswell (Nicolaus)	Union	Elected in 1863. [data missing]	Sutter, Yuba
December 4, 1865 – December 6, 1867						Eli Teegarden (Marysville)	Union	Elected in 1865. Re-elected in 1867. [data missing]
December 6, 1867 – December 6, 1869		Horace Beach (Marysville)	Union	Elected in 1867. [data missing]
December 6, 1869 – December 4, 1871		Samuel C. Hutchings (Marysville)	Democratic	Elected in 1868. [data missing]		Second seat was eliminated for the term.
December 4, 1871 – December 1, 1873						L. T. Crane (Marysville)	Republican	Elected in 1871. [data missing]

Senator	Party	Years served	Electoral history	Counties represented
Stephen L. Spencer (Camptonville)	Republican	December 1, 1873 – December 6, 1875	Elected in 1873. Redistricted to the 25th district.	Sutter, Yuba
Thomas Fraser (Placerville)	Republican	December 6, 1875 – December 3, 1877	Elected in 1874. [data missing]	Alpine, El Dorado
William H. Brown (Placerville)	Republican	December 3, 1877 – January 8, 1883	Elected in 1877. Re-elected in 1879. Re-elected in 1880. [data missing]
Thomas Fraser (Placerville)	Republican	January 8, 1883 – January 5, 1885	Elected in 1882. [data missing]
Henry Mahler (Coloma)	Democratic	January 5, 1885 – January 3, 1887	Elected in 1884. Retired to run for State Assembly.
P. J. Crimmins (San Francisco)	Republican	January 3, 1887 – January 7, 1889	Elected in 1886. [data missing]	San Francisco
William H. Williams (San Francisco)	Democratic	January 7, 1889 – January 2, 1893	Elected in 1888. [data missing]
Charles S. Arms (San Francisco)	Democratic	January 2, 1893 – January 4, 1897	Elected in 1892. [data missing]
Sydney Hall (San Francisco)	Democratic	January 4, 1897 – January 1, 1901	Elected in 1896. [data missing]
John G. Tyrrell (San Francisco)	Republican	January 1, 1901 – January 2, 1905	Elected in 1900. [data missing]
George B. Keane (San Francisco)	Republican	January 2, 1905 – January 4, 1909	Elected in 1904. [data missing]
John P. Hare (San Francisco)	Democratic	January 4, 1909 – January 6, 1913	Elected in 1908. [data missing]
Thomas F. Finn (San Francisco)	Republican	January 6, 1913 – January 8, 1917	Elected in 1912. [data missing]
Walter A. McDonald (San Francisco)	Republican	January 8, 1917 – January 5, 1925	Elected in 1916. [data missing]
Thomas A. Maloney (San Francisco)	Republican	January 5, 1925 – January 2, 1933	Elected in 1924. Re-elected in 1928. Retired to run for State Assembly.
Bert B. Snyder (Chico)	Republican	January 2, 1933 – January 4, 1937	Elected in 1932. Lost re-election.	Santa Cruz
James B. Holohan (Watsonville).	Democratic	January 4, 1937 – January 6, 1941	Elected in 1936. [data missing]
H. R. Judah (Santa Cruz)	Republican	January 6, 1941 – January 5, 1953	Elected in 1940. Re-elected in 1944. Re-elected in 1948. [data missing]
Donald L. Grunsky (Santa Cruz)	Republican	January 5, 1953 – January 2, 1967	Elected in 1952. Re-elected in 1956. Re-elected in 1960. Re-elected in 1964. Redistricted to the 17th district.	San Benito, Santa Cruz
Lou Cusanovich (Westlake Village)	Republican	January 2, 1967 – November 30, 1976	Elected in 1966. Re-elected in 1970. Re-elected in 1974. Redistricted to the 19th district.	Los Angeles
David Roberti (Los Angeles)	Democratic	December 6, 1976 – July 2, 1992	Redistricted from the 27th district and re-elected in 1976. Re-elected in 1980. Re-elected in 1984. Re-elected in 1988. Resigned to assume seat in 20th district.
Vacant		July 2, 1992 – December 7, 1992
Tom Hayden (Los Angeles)	Democratic	December 7, 1992 – November 30, 2000	Elected in 1992. Re-elected in 1996. Retired due to term limits.
Sheila Kuehl (Santa Monica)	Democratic	December 4, 2000 – November 30, 2008	Elected in 2000. Re-elected in 2004. Retired due to term limits.
Fran Pavley (Agoura Hills)	Democratic	December 1, 2008 – November 30, 2012	Elected in 2008. Redistricted to the 27th district.	Los Angeles, Ventura
Bill Emmerson (Redlands)	Republican	December 3, 2012 – December 1, 2013	Redistricted from the 37th district and Re-elected in 2012. Resigned.	Los Angeles, Riverside, San Bernardino
Vacant		December 1, 2013 – April 3, 2014
Mike Morrell (Rancho Cucamonga)	Republican	April 3, 2014 – November 30, 2020	Elected to finish Emmerson's term. Re-elected in 2016. Retired due to term limits.
Rosilicie Ochoa Bogh (Yucaipa)	Republican	December 7, 2020 – November 30, 2024	Elected in 2020. Redistricted to the 19th district.
Suzette Martinez Valladares (Santa Clarita)	Republican	December 2, 2024 – present	Elected in 2024.

• California State Senate
• California State Senate districts
• Districts in California

• District map from the California Citizens Redistricting Commission