Sleepy Hollow is a census-designated place in Marin County, California. It is located 7 miles (11 km) south of downtown Novato, at an elevation of 177 feet (54 m). Its population as of the 2010 census is 2,384.
Sleepy Hollow is located near San Anselmo, California, located outside the northern town limits. The Terra Linda district of San Rafael lies to the east. Though no roads directly connect Sleepy Hollow with Terra Linda, hiking trails do.
Butterfield Road, Sleepy Hollow’s main street, is accessed from Sir Francis Drake Boulevard, a major east-west road in Marin County. The community is in ZIP code 94960 and area codes 415 and 628.
Lucas Valley-Marinwood lies to the north of Sleepy Hollow, but there are no roads directly connecting the two unincorporated communities.
The 2010 United States Census reported that 2,384 people, 831 households, and 660 families resided in the CDP. The population density was 798.1 people per square mile (308.1/km²). There were 866 housing units at an average density of 289.9 per square mile (111.9/km²). The racial makeup of the CDP was 90.6% White(88.5% non-Hispanic), 0.6% African American, 0.4% Native American, 4.7% Asian, 0.3% Pacific Islander, 0.5% from other races, and 3.0% from two or more races. 2.9% of the population was Hispanic or Latino of any race.
The Census reported that 97.1% of the population lived in households, 2.1% lived in non-institutionalized group quarters, and 0.9% were institutionalized.
There were 831 households out of which 37.7% had children under the age of 18 living in them, 69.2% were opposite-sex married couples living together, 6.4% had a female householder with no husband present, and 3.9% had a male householder with no wife present. 3.7% of households were unmarried opposite-sex partnership sand 0.8% were same-sex married couples or partnerships. 15.0% of households were made up of individuals and 8.4% had someone living alone who was 65 years of age or older. The average household size was 2.78 and the average family size was 3.05.
The population was spread out with 26.8% under the age of 18, 5.6% aged 18 to 24, 12.2% aged 25 to 44, 914 people (38.3%) aged 45 to 64, and 17.0% who were 65 years of age or older. The median age was 48.1 years. For every 100 females, there were 94.5 males. For every 100 females age 18 and over, there were 90.9 males.
There were 866 housing units of which 90.7% were owner-occupied and 9.3% were occupied by renters. The homeowner vacancy rate was 0.3%; the rental vacancy rate was 8.3%. 87.8% of the population lived in owner-occupied housing units and 9.2% lived in rental housing units.