Much of the population of El Dorado County has become suburbanized, as the Sacramento Metropolitan Statistical Area area has expanded. In addition, the population of the Lake Tahoe area has also boomed recently.
As of the census of 2000, there were 156,299 people, 58,939 households, and 43,025 families residing in the county. The population density was 91 people per square mile (35/km²). There were 71,278 housing units at an average density of 42 per square mile (16/km²). The racial makeup of the county was 89.71% White, 0.52% Black or African American, 1.00% Native American, 2.13% Asian, 0.13% Pacific Islander, 3.55% from other races, and 2.96% from two or more races. 9.32% of the population were Hispanic or Latino of any race. 14.9% were of German, 13.4% English, 10.3% Irish, 6.6% Italian and 6.6% American ancestry according to Census 2000. 90.5% spoke English and 6.5% Spanish as their first language.
There were 58,939 households out of which 34.2% had kids under the age of 18 living with them, 60.1% were married couples living together, 8.9% had a female householder with no husband present, and 27.0% were non-families. 20.1% of all households were made up of individuals and 7.3% had someone living alone who was 65 years of age or older. The average household size was 2.63 and the average family size was 3.04.
In the county the population was spread out with 26.1% under the age of 18, 6.8% from 18 to 24, 27.8% from 25 to 44, 26.9% from 45 to 64, and 12.4% who were 65 years of age or older. The median age was 39 years. For every 100 females there were 99.5 males. For every 100 females age 18 and over, there were 97.3 males.
The 2000 census also states that the median income for a household in the county was $51,484, and the median income for a family was $60,250. Males had a median income of $46,373 versus $31,537 for females. The per capita income for the county was $25,560. About 5.0% of families and 7.1% of the population were below the poverty line, including 7.6% of those under age 18 and 5.0% of those age 65 or over.
General aviation airports are include: Placerville Airport, Georgetown Airport, Cameron Airpark and Lake Tahoe Airport.