Discovery Bay is a census-designated place (CDP) in Contra Costa County, California in the United States about 60 miles (97 km) from San Francisco. As of 2006, the town's population was about 16,500. Discovery Bay is based on a waterfront community of 3,500+ homes with private docks with access to the Sacramento-San Joaquin River Delta. Now Discovery Bay has grown and added Discovery Bay West which features gated and non-gated "off-water" communities with homes from 1,400 square feet (130 m) up to 4,700 square feet (440 m). In July 2007 Discovery Bay celebrated its maturity into its own community by changing the zip code from 94514 (which it shared with the neighboring town Byron) to 94505. A huge town celebration ensued with a world record-setting paddle boat raft-up.