San Miguel is a census-designated place[2] in Contra Costa County, California.

The 2010 United States census reported San Miguel's population was 3,392.

According to the United States Census Bureau, the CDP has a total area of 1.050 square miles (3 km2), all of it land.

The racial makeup of San Miguel was 2,986 (88.0%) White, 31 (0.9%) African American, 3 (0.1%) Native American, 190 (5.6%) Asian, 3 (0.1%) Pacific Islander, 38 (1.1%) from other races, and 141 (4.2%) from two or more races.

There were 1,291 housing units at an average density of 1,229.0 per square mile (474.5/km2),of which 1,253 were occupied, 1,143 (91.2%) by the owners and 110 (8.8%) by renters.