California's 31st State Senate district

California's 31st State Senate district
Current senator	Richard Roth D–Riverside
Population (2010)  • Voting age  • Citizen voting age	940,612 659,186 476,314
Demographics	28.71% White 9.17% Black 52.40% Latino 7.85% Asian 0.58% Native American 0.53% Hawaiian/Pacific Islander 0.25% other 0.61% remainder of multiracial
Registered voters	370,165
Registration	40.91% Democratic 33.95% Republican 20.72% No party preference

California's 31st State Senate district is one of 40 California State Senate districts. It is currently represented by Democrat Richard Roth of Riverside.

The district encompasses heavily urbanized and suburban parts of the Inland Empire located in northwestern Riverside County. It forms an arc stretching from Corona in the west to Perris in the east, centered on the county seat of Riverside.