California's 4th State Senate district

California's 4th State Senate district
Current senator	Jim Nielsen R–Gerber
Population (2010)  • Voting age  • Citizen voting age	937,962 702,185 622,033
Demographics	65.92% White 3.78% Black 19.73% Latino 6.98% Asian 2.18% Native American 0.46% Hawaiian/Pacific Islander 0.24% other 0.70% remainder of multiracial
Registered voters	477,901
Registration	38.68% Republican 33.73% Democratic 21.67% No party preference

California's 4th State Senate district is one of 40 California State Senate districts. It is currently represented by Republican Jim Nielsen of Gerber.

The district encompasses the Sacramento Valley, reaching almost to the Sacramento–San Joaquin River Delta. The district mainly comprises rural farmland, but most of the population is clustered in the Sacramento metropolitan area in the southern tip of the district.

Due to redistricting, the 4th district has been moved around different parts of the state. The current iteration resulted from the 2011 redistricting by the California Citizens Redistricting Commission.