Monte Rio is a census-designated place (CDP) in Sonoma County, California along the Russian River near the Pacific Ocean. The town of Guerneville lies east of Monte Rio, and Jenner is slightly north-west. The population was 1,104 at the 2000 census. Bohemian Grove is located in Monte Rio.
As of the census of 2000, there were 1,104 people, 549 households, and 233 families residing in the CDP. The population density was 753.5/sq mi (290.0/km²). There were 807 housing units at an average density of 550.8/sq mi (212.0/km²). The racial makeup of the CDP was 91.76% White, 0.72% African American, 0.54% Native American, 0.72% Asian, 0.09% Pacific Islander, 1.99% from other races, and 4.17% from two or more races. Hispanic or Latino of any race were 7.34% of the population.
There were 549 households out of which 19.9% had children under the age of 18 living with them, 24.0% were married couples living together, 12.6% had a female householder with no husband present, and 57.4% were non-families. 41.0% of all households were made up of individuals and 7.7% had someone living alone who was 65 years of age or older. The average household size was 2.01 and the average family size was 2.75.
In the CDP the population was spread out with 18.3% under the age of 18, 5.2% from 18 to 24, 30.3% from 25 to 44, 35.1% from 45 to 64, and 11.2% who were 65 years of age or older. The median age was 44 years. For every 100 females there were 110.3 males. For every 100 females age 18 and over, there were 113.7 males.
The median income for a household in the CDP was $38,299, and the median income for a family was $46,336. Males had a median income of $29,135 versus $28,750 for females. The per capita income for the CDP was $20,262. About 12.1% of families and 16.0% of the population were below the poverty line, including 22.7% of those under age 18 and none of those age 65 or over.
In the state legislature Monte Rio is located in the 2nd Senate District, represented by Democrat Pat Wiggins, and in the 1st Assembly District, represented by Democrat Patty Berg. Federally, Monte Rio is located in California's 6th congressional district.
Bohemian Grove, a private club, has extensive land holdings in the area, which are used for summer retreats involving many high-ranking members of the business and government communities. The club has stirred a level of opposition in the community.