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() is a city in Riverside County, California, United States, in the Colorado River Valley (in California, the "Palo Verde Valley"), an agricultural area along the Colorado River. Blythe was named after Thomas Blythe, a gold prospector who established primary water rights to the Colorado River in the region in 1877. The city was incorporated on July 21, 1916. The population was 12,155 at the 2000 census.
As of the census of 2000, there were 12,155 people, 4,103 households, and 2,974 families residing in the city. The population density was 501.5 people per square mile (193.6/km²). There were 4,891 housing units at an average density of 201.8/sq mi (77.9/km²). The racial makeup of the city was 55.41% White, 8.34% Black or African American, 1.43% Native American, 1.38% Asian, 0.20% Pacific Islander, 28.79% from other races, and 4.45% from two or more races. 45.83% of the population were Hispanic or Latino of any race.
There were 4,103 households out of which 41.4% had children under the age of 18 living with them, 50.0% were married couples living together, 16.6% had a female householder with no husband present, and 27.5% were non-families. 22.9% of all households were made up of individuals and 7.1% had someone living alone who was 65 years of age or older. The average household size was 2.91 and the average family size was 3.45.
In the city the population was spread out with 33.9% under the age of 18, 8.7% from 18 to 24, 28.4% from 25 to 44, 19.0% from 45 to 64, and 9.9% who were 65 years of age or older. The median age was 31 years. For every 100 females there were 99.2 males. For every 100 females age 18 and over, there were 97.0 males.
The median income for a household in the city was $35,324, and the median income for a family was $40,783. Males had a median income of $32,342 versus $26,671 for females. The per capita income for the city was $14,424. About 19.0% of families and 20.9% of the population were below the poverty line, including 24.9% of those under age 18 and 21.6% of those age 65 or over.