San Lorenzo, also known as San Lorenzo Village is a census-designated place (CDP) located in the San Francisco Bay Area in Alameda County, California, United States. The population was 23,452 at the 2010 census.

In 1944, under contract to the U.S. Navy, David D. Bohannon’s Greenwood Company began construction of San Lorenzo Village, which was one of the nation’s first planned communities, with parcels designated for schools, churches, parks, and several retail centers. Bohannon’s pioneering pre-cutting techniques, referred to as the “California method,” were used in later developments, such as the more famous Levittown, Pennsylvania.


According to the United States Census Bureau, the CDP has a total area of 2.8 square miles (7.3 km2), of which, 2.8 square miles (7.3 km2) is land and 0.24% is water. San Lorenzo Creek runs partly through the town. It is located between the incorporated cities of San Leandro to the north and Hayward to the south.



San Lorenzo is an unincorporated community and thus is governed directly by the County of Alameda. The area is policed by the Alameda County Sheriff’s Office.