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Napa () is the largest city in and the county seat of Napa County, California. It is the principal city of the Napa County Metropolitan Statistical Area, with a population of 78,130 as of the 2019 United States census estimate. It is the second-largest city in California's Wine Country, after Santa Rosa. Napa was incorporated as a city in 1872.
Berkeley ( BURK-lee) is a city on the eastern shore of San Francisco Bay in northern Alameda County, California, United States. It is named after the 18th-century Irish bishop and philosopher George Berkeley. It borders the cities of Oakland and Emeryville to the south and the city of Albany and the unincorporated community of Kensington to the north. Its eastern border with Contra Costa County generally follows the ridge of the Berkeley Hills. The 2020 census recorded a population of 124,321. Berkeley is home to the oldest campus in the University of California system, the University of California, Berkeley, and the Lawrence Berkeley National Laboratory, which is managed and operated by the university. It also has the Graduate Theological Union, one of the largest religious studies institutions in the world. Berkeley is considered one of the most socially liberal cities in the United States.
Sonoma is a city in Sonoma County, California in Sonoma Valley. Known as a part of Wine Country in the Sonoma Valley AVA Appellation, Sonoma is the home of the Sonoma International Film Festival and a historic town plaza, a remnant of the town's Mexican colonial past. Sonoma's population was 10,648 as of the 2010 census, while the Sonoma urban area had a population of 32,678.
Walnut Creek is a city in Contra Costa County, California, United States, located in the East Bay region of the San Francisco Bay Area, about 16 miles (26 km) east of the city of Oakland. With a total estimated population of 70,166, Walnut Creek serves as a hub for its neighboring cities because of its location at the junction of the highways from Sacramento and San Jose (I-680) and San Francisco/Oakland (SR-24) and its accessibility by BART. Its active downtown neighborhood features hundred-year-old buildings and extensive high-end retail establishments.