925 Area Code 🌍☎️

Walnut Creek is a city in Contra Costa County, California, located in the East Bay region of the San Francisco Bay Area approximately 16 miles east of Oakland and 25 miles east of San Francisco, with a 2020 census population of 70,127. The city sits at the junction of Interstate 680 and State Route 24, is served by BART's Yellow Line, and borders Clayton, Lafayette, Alamo, Pleasant Hill, and Concord. Named after the local walnut tree species Juglans hindsii, Walnut Creek developed within four Mexican land grants, including the 18,000-acre Rancho Arroyo de Las Nueces y Bolbones granted to Juana Sanchez de Pacheco, with William Slusher serving as the first American settler in 1849. The city was officially incorporated on October 21, 1914 as Contra Costa County's eighth city, and its development accelerated dramatically following the 1951 opening of Broadway Shopping Center - the county's first major retail center - which helped the population grow from 2,460 in 1950 to 9,903 by 1960. Southern Pacific Railroad service arriving in 1891 and subsequent suburban growth transformed Walnut Creek into a major East Bay commercial and residential hub. Concord is the most populous city in Contra Costa County, California, located 29 miles east of San Francisco in the East Bay region of the San Francisco Bay Area, with a 2025 population of 123,261 making it the tenth largest city in the Bay Area. Founded in 1869 as Todos Santos by Californio ranchero Salvio Pacheco II on land granted to his family in 1834, the city was incorporated on February 5, 1905, after residents relocated from nearby Pacheco to escape fire and flood damage. The surrounding Ygnacio and Clayton valleys developed as a major agricultural center producing grapes, walnuts, almonds, wheat, and other crops throughout the 19th and early 20th centuries, while the Concord Naval Weapons Station site once contained enormous wheat ranches exceeding 5,000 acres. Concord is notable as the site of the Port Chicago disaster on July 17, 1944, when a Navy munitions ship explosion killed 320 workers and sparked the Navy's largest mutiny trial, drawing future Supreme Court Justice Thurgood Marshall's attention to alleged prejudice in the proceedings. The city serves as the principal center of the Concord-Walnut Creek urban area with a population of 538,583, and features the downtown Todos Santos Plaza as its focal point for farmers markets, concerts, and dining. San Ramon is a city in Contra Costa County, California, located 34 miles east of San Francisco in the San Ramon Valley with a 2020 population of 84,605, making it the fourth-largest city in the county. Named after a Native American vaquero by José María Amador, who received the land as a rancho grant in 1834, San Ramon became the official place name in 1873 when a post office opened, further solidified by the arrival of the San Ramon Branch Line of the Southern Pacific Railroad in 1891. The city is home to major corporations including Cooper Companies, AT&T's West Coast headquarters, and GE Digital, as well as the San Ramon Medical Center. San Ramon features diverse geography with Mount Diablo prominently visible to the northeast, rolling hills from the Diablo Range, and grasslands and oak orchards on its perimeter, with a Mediterranean climate characterized by warm dry summers and cool wet winters. The city hosts major annual events including the Art and Wind Festival on Memorial Day weekend and the Run for Education in October, and was designated a Tree City USA in 2001.