California's 78th State Assembly district is one of 80 California State Assembly districts. It is currently represented by of .
The district takes in a stretch of north-central San Diego County from the San Diego Zoo and Banker's Hill, with the southerly border just north of downtown San Diego, and running north to the Clairemont Mesa and Mira Mesa neighborhoods, and east past Mission Trails Regional Park through San Carlos and Fletcher Hills to the western edges of El Cajon. Over 93% of the district population is in the City of San Diego, with the remainder almost entirely in El Cajon, as of February 2026. Previously, the district was more coastal, from Solana Beach to the Mexican border, including downtown San Diego, beachfront neighborhoods, and the UC San Diego.
San Diego County â 14.9%
Due to redistricting, the 78th district has been moved around different parts of the state. The current iteration resulted from the 2021 redistricting by the California Citizens Redistricting Commission.