California’s 11th State Senatorial district is one of 40 California State Senate districts.
The district encompasses the northern San Francisco Peninsula, including the consolidated city-county of San Francisco and extreme northern San Mateo County.
https://en.wikipedia.org/wiki/California%27s_11th_State_Senatorial_district#:~:text=California’s%2011th%20State%20Senatorial%20district%20is%20one%20of%2040%20California,Scott%20Wiener%20of%20San%20Francisco.