California's 2nd State Senate district
Current senator	Mike McGuire D–Healdsburg
Population (2010)  • Voting age  • Citizen voting age	928,077[1] 729,486[1] 635,914[1]
Demographics	69.94% White 2.10% Black 19.53% Latino 4.29% Asian 3.02% Native American 0.32% Hawaiian/Pacific Islander 0.35% other 0.45[1]% remainder of multiracial
Registered voters	551,154[2]
Registration	53.40% Democratic 19.12% Republican 21.53% No party preference

California's 2nd senatorial district is one of 40 California State Senate districts. It is currently represented by Democrat Mike McGuire of Healdsburg.

The district stretches along the North Coast from the Oregon border in the north to the northern San Francisco Bay Area in the south. It includes Del Norte, Humboldt, Trinity, Mendocino, Sonoma, and Marin Counties. The northern part of district is primarily rural, while the southern parts are more suburban.

Years		Seat A				Seat B			Counties represented
		Member	Party	Electoral history		Member	Party	Electoral history
District established January 6, 1851
January 6, 1851 – January 11, 1851		Stephen C. Foster (Los Angeles)	Democratic	Elected in 1850. Redistricted to the single-member district after Hope resigned.		Alexander W. Hope (Los Angeles)	Republican	Redistricted from the Los Angeles and San Diego districts and re-elected in 1850. Resigned.	Los Angeles

Senators	Party	Years served	Electoral history	Counties represented
Stephen C. Foster (Los Angeles)	Democratic	January 11, 1851 – January 2, 1854	Redistricted from single-member district. Re-elected in 1851. Re-elected in 1852. [data missing]	Los Angeles
Pablo de la Guerra (Santa Barbara)	Democratic	January 2, 1854 – January 6, 1862	Redistricted from the 3rd district and re-elected in 1854. Re-elected in 1855. Re-elected in 1856. Re-elected in 1859. Re-elected in 1860. [data missing]	San Luis Obispo, Santa Barbara
	Douglas Democratic
James R. Vineyard (Los Angeles)	Democratic	January 6, 1862 – August 30, 1863	Elected in 1861. Died.	Los Angeles
Vacant		August 30, 1863 – December 7, 1863
Henry Hamilton (Los Angeles)	Democratic	December 7, 1863 – December 4, 1865	Elected in 1863. [data missing]
Phineas Banning (Wilmington)	Democratic	December 4, 1865 – December 6, 1869	Elected in 1863. [data missing]
B. D. Wilson (Los Angeles)	Independent	December 6, 1869 – January 8, 1873	Elected in 1868. [data missing]
C. W. Bush (Los Angeles)	Independent	January 8, 1873 – December 3, 1877	Elected in 1873. [data missing]
George H. Smith (Los Angeles)	Democratic	December 3, 1877 – January 5, 1880	Elected in 1877. [data missing]
John P. West (Los Angeles)	Workingmen's	January 5, 1880 – January 8, 1883	Elected in 1879. [data missing]
R. F. del Valle (Los Angeles)	Democratic	January 8, 1883 – January 3, 1887	Elected in 1882. Re-elected in 1884. [data missing]
John M. Briceland (Shasta)	Democratic	January 3, 1887 – January 5, 1891	Elected in 1886. [data missing]	Shasta, Siskiyou, Trinity
R. H. Campbell (Etna)	Republican	January 5, 1891 – January 7, 1895	Elected in 1890. [data missing]
				Lassen, Modoc, Shasta, Siskiyou, Trinity
James M. Gleaves (Shasta)	Republican	January 7, 1895 – January 2, 1899	Elected in 1894. Retired after being appointed as Surveyor General of California.
James T. Laird (Alturas)	Republican	January 2, 1899 – January 5, 1903	Elected in 1898. [data missing]
Clifford Coggins (Igerna)	Republican	January 5, 1903 – January 7, 1907	Elected in 1902. [data missing]	Lassen, Modoc, Shasta, Siskiyou
Abner Weed (Mount Shasta)	Republican	January 7, 1907 – January 2, 1911	Elected in 1906. [data missing]
T. W. H. Shanahan (Redding)	Democratic	January 2, 1911 – January 4, 1915	Elected in 1910. [data missing]
William B. Shearer (Yreka)	Democratic	January 4, 1915 – January 8, 1923	Elected in 1914. Re-elected in 1918. [data missing]
Franklin J. Powers (Eagleville)	Republican	January 8, 1923 – January 3, 1927	Elected in 1922. [data missing]
James M. Allen (Yreka)	Democratic	January 3, 1927 – January 7, 1935	Elected in 1926. Re-elected in 1930. [data missing]
				Del Norte, Siskiyou
Henry M. McGuinness (Dunsmuir)	Democratic	January 7, 1935 – March 16, 1936	Elected in 1934. Died.
Vacant		March 16, 1936 – May 25, 1936
James M. Allen (Yreka)	Democratic	May 25, 1936 – January 2, 1939	Elected to finish McGuinness's term. [data missing]
Randolph Collier (Yreka)	Republican	January 2, 1939 – January 2, 1967	Elected in 1938. Re-elected in 1942. Re-elected 1946. Re-elected in 1950. Re-elected in 1954. Re-elected in 1958. Re-elected in 1962. Redistricted to the 1st district.
	Democratic
Fred W. Marler Jr. (Redding)	Republican	January 2, 1967 – November 30, 1974	Elected in 1966. Re-elected in 1970. Retired to become a Justice of the Sacramento County Superior Court.	Shasta, Butte, Colusa Glenn, Sutter, Tehama, Yolo, Yuba, Solano
Peter H. Behr (San Rafael)	Republican	December 2, 1974 – November 30, 1978	Redistricted from the 4th district and re-elected in 1974. Retired.	Marin, Solano, Napa
				Del Norte, Humboldt, Lake, Marin, Mendocino, Sonoma
Barry Keene (Santa Rosa)	Democratic	December 4, 1978 – December 15, 1992	Elected in 1978. Re-elected in 1982. Re-elected in 1986. Re-elected in 1990. Resigned.
Vacant		December 15, 1992 – May 20, 1993		Del Norte, Humboldt, Mendocino, Solano, Sonoma
Mike Thompson (St. Helena)	Democratic	May 20, 1993 – November 30, 1998	Elected to finish Keene's term. Re-elected in 1994. Retired to run for U.S. House of Representatives.
				Del Norte, Humboldt, Mendocino, Solano, Sonoma, Lake, Napa
Wesley Chesbro (Arcata)	Democratic	December 7, 1998 – November 30, 2006	Elected in 1998. Re-elected in 2002. Retired due to term limits.
				Humboldt, Mendocino, Solano, Sonoma, Lake, Napa
Pat Wiggins (Santa Rosa)	Democratic	December 4, 2006 – November 30, 2010	Elected in 2006. Retired.
Noreen Evans (Santa Rosa)	Democratic	December 6, 2010 – November 30, 2014	Elected in 2010. Retired.
Mike McGuire (Healdsburg)	Democratic	December 1, 2014 – present	Elected in 2014. Re-elected in 2018. Re-elected in 2022.	Del Norte, Humboldt, Lake, Marin, Mendocino, Sonoma Trinity

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

• District map from the California Citizens Redistricting Commission