Oakley is a city in Contra Costa County, California, United States. It is within the nine-county San Francisco Bay Area. The population at the 2020 United States census was 43,357. Oakley was incorporated in 1999, making it the newest incorporated city in Contra Costa County.
The name "oak" comes from the abundance of oak trees, while the suffix "-ley" comes from the Old English word for "field" or "meadow".
The name Oakley is of Old English origin and its meaning is "meadow of oak trees". This aptly describes the area when first settled and to some extent even today. However, if not for the flip of a coin and cribbage board the community may have been named Dewey. City founder Randolph Marsh wanted to name the city Dewey, after Admiral Dewey, in honor of Dewey's success at Battle of Manila Bay during the Spanish–American War. His friend J.T. Whightman preferred the name "Oakley" because the terrain was largely meadows and oaks. To determine which name would prevail