California’s 28th State Senatorial district is one of 40 California State Senate districts. The district comprises the central and eastern portions of Riverside County (including the Coachella Valley) as well as the southern Inland Empire.
https://en.wikipedia.org/wiki/California%27s_28th_State_Senatorial_district#:~:text=California’s%2028th%20State%20Senatorial%20district%20is%20one%20of%2040%20California,Smallwood%2DCuevas%20of%20Los%20Angeles.