Woodacre is an unincorporated town and census-designated place (CDP) located in the San Geronimo Valley in Marin County, California. Woodacre is located 8 miles (13 km) south-southwest of Novato, and 8 miles northwest of San Rafael, the nearest incorporated town is Fairfax, 4 miles east-southeast. Woodacre has the highest base elevation in Marin County, of 364 feet (111 m). The population was 1,348 at the 2010 census.
Woodacre is located at 38°00′46″N 122°38′43″W / 38.01278°N 122.64528°W / 38.01278; -122.64528.
According to the United States Census Bureau, the CDP has a total area of 1.8 square miles (4.7 km²), all of it land.