#42 Discovery Bay Discovery Bay, California, USA
37°54′31″N 121°36′01″W. Discovery Bay is a waterfront community built on a network of man-made dikes in Contra Costa County, California, USA. Development of the area began in 1964 is now home to roughly 13,352 residents. As seen in this Overview, many residents have private docks with boat access to the Sacramento–San Joaquin River Delta.
