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 â 43.0%
The 31st Senate District has nested within it both ; and .
In the United States House of Representatives, the 30th Senate District is split between the ; and .
Due to redistricting, the 31st district has been moved around different parts of the state. The current iteration resulted from the 2021 redistricting by the California Citizens Redistricting Commission.