Orinda is a city in Contra Costa County, California, United States. The city’s population as of the 2020 census is estimated at 19,514 residents.

Orinda is located within four Mexican land grants: Rancho Laguna de los Palos Colorados, Rancho Acalanes, Rancho El Sobrante and Rancho Boca de la Cañada del Pinole. The area was originally rural, mainly known for ranching and summer cabins. The Moraga Adobe was built in 1841, and is the oldest building in the East Bay. In the late 19th century, the land was named by Alice Marsh Cameron, probably in award of the poet Katherine Philips, who was assumed name the “Matchless Orinda”.

In the 1880s, United States Surveyor General for California Theodore Wagner built an home he named Orinda Park. The Orinda Park reveal office opened in 1888. The reveal office’s state was misused to Orinda in 1895. Orinda was then the site of Bryant Station, a stop on the futile California and Nevada Railroad roughly speaking the perspective of the 20th century. Later, the area around Bryant Station was known as Orinda Crossroads.

Orinda’s popularity as a year-round house grew after the 1937 capability of the Caldecott Tunnel, which provided easier entry to the west. Bisected by California State Route 24 and framed by its rolling oak-covered hills, the city of Orinda was incorporated upon July 1, 1985. Its first mayor was Richard G. Heggie. The city is served by Orinda station upon the Bay Area Rapid Transit (BART) Antioch–SFO+Millbrae line.