| District: | 31 |
| Chamber: | Senate |
| Population: | 940,612[1] |
| Population Year: | 2010 |
| Voting Age: | 659,186 |
| Citizen Voting Age: | 476,314 |
| Percent White: | 28.71 |
| Percent Black: | 9.17 |
| Percent Latino: | 52.40 |
| Percent Asian: | 7.85 |
| Percent Native American: | 0.58 |
| Percent Pacific Islander: | 0.43 |
| Percent Other Race: | 0.25 |
| Percent Remainder Of Multiracial: | 0.61 |
| Registered: | 451,552[2] |
| Democratic: | 44.99 |
| Republican: | 27.50 |
| Npp: | 21.90 |
California's 31st senatorial district is one of 40 California State Senate districts. It is currently represented by of .
The district encompasses urbanized and suburban parts of the Inland Empire in northwestern Riverside County. It forms an arc stretching from Corona in the west to Perris in the southeast, centered on the city of Riverside.
Riverside County – 43.0%
The 31st Senate District has nested within it both ; and .[3]
In the United States House of Representatives, the 30th Senate District is split between the ; and .
| Year | Office | Results |
|---|---|---|
| 2021 | Recall | align="right" No 54.5 – 45.5% |
| 2020 | President | Biden 58.3 – 39.6% |
| 2018 | Governor | Newsom 55.9 – 44.1% |
| Senator | Feinstein 50.7 – 49.3% | |
| 2016 | President | Clinton 57.4 – 36.9% |
| Senator | Harris 53.5 – 46.5% | |
| 2014 | Governor | Brown 50.6 – 49.4% |
| 2012 | President | Obama 57.5 – 40.3% |
| Senator | Feinstein 59.0 – 41.0% |
| Senators | Party | Years served | Electoral history | Counties represented | |
|---|---|---|---|---|---|
| District established January 3, 1887 | |||||
A. W. Crandall | Republican | January 3, 1887 – January 2, 1893 | Elected in 1886. Re-elected in 1888. | Santa Clara | |
L. A. Whitehurst | Democratic | January 2, 1893 – January 4, 1897 | Elected in 1892. | ||
Henry V. Morehouse | Republican | January 4, 1897 – January 1, 1901 | Elected in 1898. | ||
Louis Oneal | Republican | January 1, 1901 – January 2, 1905 | Elected in 1900. | ||
Henry W. Lynch | Republican | January 2, 1905 – January 6, 1913 | Elected in 1904. Re-elected in 1908. | Monterey, San Benito, San Luis Obispo | |
Edwin M. Butler | Republican | January 6, 1913 – January 8, 1917 | Elected in 1912. | Los Angeles | |
Harry A. Chamberlin | Republican | January 8, 1917 – January 7, 1929 | Elected in 1916. Re-elected in 1920. Re-elected in 1924. | ||
Henry E. Carter | Republican | January 7, 1929 – January 2, 1933 | Elected in 1928. | ||
Edgar W. Stow | Republican | January 2, 1933 – January 4, 1937 | Elected in 1932. | Santa Barbara | |
John J. Hollister Sr. | Democratic | January 4, 1937 – January 6, 1941 | Elected in 1936. Lost re-election. | ||
Clarence C. Ward | Republican | January 6, 1941 – May 9, 1955 | Elected in 1940. Re-elected in 1944. Re-elected in 1948. Re-elected in 1952. Died. | ||
| Vacant | May 9, 1955 – December 2, 1955 | ||||
John J. Hollister Jr. | Democratic | December 2, 1955 – November 23, 1961 | Elected to finish Ward's term. Re-elected in 1956. Re-elected in 1960. Died. | ||
| Vacant | November 23, 1961 – February 24, 1962 | ||||
Alvin C. Weingand | Democratic | February 24, 1962 – January 2, 1967 | Elected to finish Hollister Jr.'s term. Re-elected in 1964. Redistricted to the 24th district and lost re-election. | ||
James Q. Wedworth | Democratic | January 2, 1967 – November 30, 1976 | Elected in 1966. Re-elected in 1968. Re-elected in 1972. Redistricted to the 27th district and lost re-election. | Los Angeles | |
George Deukmejian | Republican | December 6, 1976 – January 8, 1979 | Redistricted from the 37th district and re-elected in 1976. Resigned after becoming Attorney General. | ||
| Vacant | January 8, 1979 – April 26, 1979 | ||||
Ollie Speraw | Republican | April 26, 1979 – November 30, 1984 | Elected to finish vacant term. Re-elected in 1980. Retired. | ||
William Campbell | Republican | December 3, 1984 – December 15, 1989 | Redistricted from the 33rd district and re-elected in 1984. Re-elected in 1988. Resigned. | Los Angeles, Orange | |
| Vacant | December 15, 1989 – April 16, 1990 | ||||
Frank Hill | Republican | April 16, 1990 – November 30, 1992 | Elected to finish Campbell's term. Redistricted to the 29th district. | ||
Bill Leonard | Republican | December 7, 1992 – November 30, 1996 | Redistricted from the 25th district and re-elected in 1992. Retired to run for State Assembly. | Riverside, San Bernardino | |
Jim Brulte | Republican | December 2, 1996 – November 30, 2004 | Elected in 1996. Re-elected in 2000. Termed out. | ||
Robert Dutton | Republican | December 6, 2004 – November 30, 2012 | Elected in 2004. Re-elected in 2008. Retired to run for U.S. House of Representatives. | ||
Richard Roth | Democratic | December 3, 2012 – present | Elected in 2012. Re-elected in 2016. Re-elected in 2020. Termed out. | Riverside | |