What is the richest city in California?

The richest city in California is Hillsborough. Located in San Mateo County, Hillsborough is known for its affluent residential neighborhoods and high housing prices. According to the 2020 U.S. Census, the median household income in Hillsborough was approximately $275,000, making it one of the wealthiest communities in the country. The city is home to several large estates and luxurious properties, and it has been recognized for its high quality of life and scenic surroundings.