Sonoma County is world-famous as a wine growing region.
Sonoma County was one of the original counties of California, created in 1850 at the time of statehood.
According to the U.S. Census Bureau, the county has a total area of 4,580 km² (1,768 mi²). 4,082 km² (1,576 mi²) of it is land and 498 km² (192 mi²) of it is water. The total area is 10.88% water.
As of the census2 of 2000, there are 458,614 people, 172,403 households, and 112,406 families residing in the county. The population density is 112/km² (291/mi²). There are 183,153 housing units at an average density of 45/km² (116/mi²). The racial makeup of the county is 81.60% White, 1.42% Black or African American, 1.18% Native American, 3.07% Asian, 0.20% Pacific Islander, 8.44% from other races, and 4.09% from two or more races. 17.34% of the population are Hispanic or Latino of any race.
There are 172,403 households out of which 31.90% have children under the age of 18 living with them, 50.30% are married couples living together, 10.40% have a female householder with no husband present, and 34.80% are non-families. 25.70% of all households are made up of individuals and 10.00% have someone living alone who is 65 years of age or older. The average household size is 2.60 and the average family size is 3.12.
In the county the population is spread out with 24.50% under the age of 18, 8.80% from 18 to 24, 29.20% from 25 to 44, 24.90% from 45 to 64, and 12.60% who are 65 years of age or older. The median age is 38 years. For every 100 females there are 97.00 males. For every 100 females age 18 and over, there are 94.00 males.
The median income for a household in the county is $53,076, and the median income for a family is $61,921. Males have a median income of $42,035 versus $32,022 for females. The per capita income for the county is $25,724. 8.10% of the population and 4.70% of families are below the poverty line. Out of the total people living in poverty, 8.40% are under the age of 18 and 5.70% are 65 or older.