Jabarkan 2000 dari Orange County, California dalam bahasa melayu

As of the census of 2000, there were 2,846,289 people, 935,287 households, and 667,794 families living in the county, making Orange County the second most populous county in California. The population density was 1,392/km2 (3,606/sq mi). There were 969,484 housing units at an average density of 474/km2 (1,228/sq mi). The racial makeup of the county was 64.8% White, 13.6% Asian, 1.7% African American, 0.7% Native American, 0.3% Pacific Islander, 14.8% from other races, and 4.1% from two or more races. 30.8% are Hispanic or Latino of any race. 8.9% were of German, 6.9% English and 6.0% Irish ancestry according to Census 2000. 58.6% spoke only English at home; 25.3% spoke Spanish, 4.7% Vietnamese, 1.9% Korean, 1.5% Chinese (Cantonese or Mandarin) and 1.2% Tagalog.

In 1990, still according to the census there were 2,410,556 people living in the county. The racial makeup of the county was 78.6% White, 10.3% Asian or Pacific Islander, 1.8% African American, 0.5% Native American, and 8.8% from other races. 23.4% were Hispanic or Latino of any race.

Out of 935,287 households, 37.0% had children under the age of 18 living with them, 55.9% married couples were living together, 10.7% had a female householder with no husband present, and 28.6% were non-families. 21.1% of all households were made up of individuals and 7.2% had someone living alone who was 65 years of age or older. The average household size was 3.00 and the average family size was 3.48.

Ethnic change has been transforming the population. By 2009, nearly 45 percent of the residents spoke a language other than English at home. Whites now comprise only 45 percent of the population, while the numbers of Hispanics grow steadily, along with Vietnamese, Korean and Chinese families. The percentage of foreign-born residents jumped to 30 percent in 2008 from 6 percent in 1970.  The mayor of Irvine, Sukhee Kang, was born in Korea, making him the first Korean-American to run a major American city. “We have 35 languages spoken in our city,” Kang observed. The population is diverse age-wise, with 27.0% under the age of 18, 9.4% from 18 to 24, 33.2% from 25 to 44, 20.6% from 45 to 64, and 9.9% 65 years of age or older. The median age is 33 years. For every 100 females, there were 99.0 males. For every 100 females age 18 and over, there were 96.7 males.

The median income for a household in the county was $61,899, and the median income for a family was $75,700 (these figures had risen to $71,601 and $81,260 respectively as of a 2007 estimate). Males had a median income of $45,059 versus $34,026 for females. The per capita income for the county was $25,826. About 7.0% of families and 10.3% of the population were below the poverty line, including 13.2% of those under age 18 and 6.2% of those age 65 or over.

Residents of Orange County are known as "Orange Countians".