|— census-designated place —|
|Marin County and the state of California|
|• County Board||District 4
|• State Senate||Mark Leno (D)|
|• Assembly||Marc Levine (D)|
|• U. S. Congress||Jared Huffman (D)|
|• Total||1.797 sq mi (4.653 km2)|
|• Land||1.797 sq mi (4.653 km2)|
|• Water||0 sq mi (0 km2) 0%|
|Elevation||364 ft (111 m)|
|• Density||750/sq mi ( 290/km2)|
|Time zone||PST (UTC-8)|
|• Summer (DST)||PDT (UTC-7)|
|GNIS feature ID||1652657|
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 .
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.
The 2010 United States Census reported that Woodacre had a population of 1,348. The population density was 750.3 people per square mile (289.7/km²). The racial makeup of Woodacre was 1,231 (91.3%) White, 3 (0.2%) African American, 4 (0.3%) Native American, 27 (2.0%) Asian, 4 (0.3%) Pacific Islander, 10 (0.7%) from other races, and 69 (5.1%) from two or more races. Hispanic or Latino of any race were 77 persons (5.7%).
The Census reported that 100% of the population lived in households.
There were 595 households, out of which 144 (24.2%) had children under the age of 18 living in them, 279 (46.9%) were opposite-sex married couples living together, 54 (9.1%) had a female householder with no husband present, 25 (4.2%) had a male householder with no wife present. There were 49 (8.2%) unmarried opposite-sex partnerships, and 11 (1.8%) same-sex married couples or partnerships. 163 households (27.4%) were made up of individuals and 44 (7.4%) had someone living alone who was 65 years of age or older. The average household size was 2.27. There were 358 families (60.2% of all households); the average family size was 2.72.
The population was spread out with 238 people (17.7%) under the age of 18, 53 people (3.9%) aged 18 to 24, 262 people (19.4%) aged 25 to 44, 575 people (42.7%) aged 45 to 64, and 220 people (16.3%) who were 65 years of age or older. The median age was 50.5 years. For every 100 females there were 92.0 males. For every 100 females age 18 and over, there were 88.5 males.
There were 639 housing units at an average density of 355.7 per square mile (137.3/km²), of which 74.6% were owner-occupied and 25.4% were occupied by renters. The homeowner vacancy rate was 0.7%; the rental vacancy rate was 2.6%. 77.3% of the population lived in owner-occupied housing units and 22.7% lived in rental housing units.
As of the census of 2000, there were 1,393 people, 548 households, and 381 families residing in the CDP. The population density was 763.6 people per square mile (295.5/km²). There were 570 housing units at an average density of 312.5 per square mile (120.9/km²). The racial makeup of the CDP inj 2010 was 88.0% non-Hispanic White, 0.2% non-Hispanic African American, 0.1% Native American, 2.0% Asian, 0.3% Pacific Islander, 0.3% from other races, and 3.3% from two or more races. Hispanic or Latino of any race were 5.7% of the population.
There were 548 households out of which 34.3% had children under the age of 18 living with them, 55.3% were married couples living together, 11.3% had a female householder with no husband present, and 30.3% were non-families. 19.5% of all households were made up of individuals and 4.4% had someone living alone who was 65 years of age or older. The average household size was 2.54 and the average family size was 2.90.
In the CDP the population was spread out with 23.0% under the age of 18, 3.7% from 18 to 24, 25.8% from 25 to 44, 38.8% from 45 to 64, and 8.7% who were 65 years of age or older. The median age was 44 years. For every 100 females there were 92.1 males. For every 100 females age 18 and over, there were 88.2 males.
The median income for a household in the CDP was $62,917, and the median income for a family was $71,250. Males had a median income of $50,109 versus $40,167 for females. The per capita income for the CDP was $31,996. About 3.9% of families and 6.6% of the population were below the poverty line, including 8.4% of those under age 18 and none of those age 65 or over.
Notable people 
- William Windom, American actor retired to Woodacre and died there in 2012.
- "California's 2nd Congressional District - Representatives & District Map". Civic Impulse, LLC. Retrieved March 8, 2013.
- U.S. Census
- U.S. Geological Survey Geographic Names Information System: Woodacre, California
- Durham, David L. (1998). California's Geographic Names: A Gazetteer of Historic and Modern Names of the State. Quill Driver Books. p. 723. ISBN 9781884995149.
- All data are derived from the United States Census Bureau reports from the 2010 United States Census, and are accessible on-line here. The data on unmarried partnerships and same-sex married couples are from the Census report DEC_10_SF1_PCT15. All other housing and population data are from Census report DEC_10_DP_DPDP1. Both reports are viewable online or downloadable in a zip file containing a comma-delimited data file. The area data, from which densities are calculated, are available on-line here. Percentage totals may not add to 100% due to rounding. The Census Bureau defines families as a household containing one or more people related to the householder by birth, opposite-sex marriage, or adoption. People living in group quarters are tabulated by the Census Bureau as neither owners nor renters. For further details, see the text files accompanying the data files containing the Census reports mentioned above.
- "American FactFinder". United States Census Bureau. Retrieved 2008-01-31.