Former census-designated place
|Incorporated into Jurupa Valley||July 1, 2011|
|• Total||9.945 sq mi (25.757 km2)|
|• Land||9.659 sq mi (25.017 km2)|
|• Water||0.286 sq mi (0.740 km2) 2.87%|
|Elevation||774 ft (236 m)|
|• Density||3,400/sq mi (1,300/km2)|
|Time zone||UTC-8 (PST)|
|• Summer (DST)||UTC-7 (PDT)|
|GNIS feature ID||1661345|
Rubidoux (// ROO-bid-oh) was a census-designated place and an unincorporated community in Riverside County, California. As of the 2010 census, the population was 34,280, up from 29,180 at the 2000 census. Like much of the fast-growing Inland Empire Metropolitan Area, Rubidoux is rapidly changing from a rural area of quarries and dairy farms to an exurb of Riverside. As of the 2000 Census, Rubidoux was the largest unincorporated community in the Inland Empire and in Riverside County. On July 1, 2011, the CDP became part of the newly incorporated City of Jurupa Valley.
Rubidoux is iconically identified with its landmark, Mount Rubidoux.
Rubidoux was located at  According to the United States Census Bureau, the CDP had a total area of 9.9 square miles (25.6 km2), of which 9.7 square miles (25.1 km2) was land and 0.3 square miles (0.8 km2) (2.87%) was water..
The community's name refers to Louis Robidoux who settled in the area in 1843. Of French Canadian origin, Robidoux's grandfather migrated from Quebec to St. Louis, Missouri, where his interest in the fur trade expanded to become the family business. Robidoux and his brothers became US citizens after 1803 when St. Louis officially became part of the United States. Robidoux was also a naturalized Mexican citizen who had served as Alcalde of Santa Fe, New Mexico. The town of Rubidoux is sited on part of what was once Rancho Jurupa, the Robidoux family ranch. Current descendants of Robidoux now spell their surname Rubidoux.
On March 8, 2011, voters of Rubidoux and adjoining towns passed Measure A by a 54% "Yes" vote, to incorporate the areas of Mira Loma, Pedley, Rubidoux, Glen Avon, and Sunnyslope into the new city of Jurupa Valley. The effective date of incorporation was July 1, 2011.
Population by year 
(Z): Area returned as West Riverside
The 2010 United States Census reported that Rubidoux had a population of 34,280. The population density was 3,447.0 people per square mile (1,330.9/km²). The racial makeup of Rubidoux was 16,935 (49.4%) White, 1,850 (5.4%) African American, 391 (1.1%) Native American, 855 (2.5%) Asian, 136 (0.4%) Pacific Islander, 12,469 (36.4%) from other races, and 1,644 (4.8%) from two or more races. Hispanic or Latino of any race were 23,322 persons (68.0%).
The Census reported that 33,958 people (99.1% of the population) lived in households, 106 (0.3%) lived in non-institutionalized group quarters, and 216 (0.6%) were institutionalized.
There were 8,931 households, out of which 4,730 (53.0%) had children under the age of 18 living in them, 5,043 (56.5%) were opposite-sex married couples living together, 1,459 (16.3%) had a female householder with no husband present, 762 (8.5%) had a male householder with no wife present. There were 651 (7.3%) unmarried opposite-sex partnerships, and 61 (0.7%) same-sex married couples or partnerships. 1,261 households (14.1%) were made up of individuals and 473 (5.3%) had someone living alone who was 65 years of age or older. The average household size was 3.80. There were 7,264 families (81.3% of all households); the average family size was 4.13.
The population was spread out with 10,997 people (32.1%) under the age of 18, 4,038 people (11.8%) aged 18 to 24, 9,304 people (27.1%) aged 25 to 44, 7,367 people (21.5%) aged 45 to 64, and 2,574 people (7.5%) who were 65 years of age or older. The median age was 29.2 years. For every 100 females, there were 100.4 males. For every 100 females age 18 and over, there were 98.1 males.
There were 9,518 housing units at an average density of 957.1 per square mile (369.5/km²), of which 5,834 (65.3%) were owner-occupied, and 3,097 (34.7%) were occupied by renters. The homeowner vacancy rate was 2.8%; the rental vacancy rate was 6.5%. 22,079 people (64.4% of the population) lived in owner-occupied housing units and 11,879 people (34.7%) lived in rental housing units.
As of the census of 2000, there were 29,180 people, 7,991 households, and 6,464 families residing in the CDP. The population density was 3,186.5 people per square mile (1,230.0/km²). There were 8,497 housing units at an average density of 927.9 per square mile (358.2/km²). The racial makeup of the CDP was 51.8% White, 7.3% African American, 1.4% Native American, 2.2% Asian, 0.3% Pacific Islander, 32.0% from other races, and 4.9% from two or more races. Hispanic or Latino of any race were 54.3% of the population.
There were 7,991 households out of which 48.8% had children under the age of 18 living with them, 56.6% were married couples living together, 16.9% had a female householder with no husband present, and 19.1% were non-families. 14.4% of all households were made up of individuals and 5.2% had someone living alone who was 65 years of age or older. The average household size was 3.6 and the average family size was 3.9.
In the CDP the population was spread out with 36.0% under the age of 18, 10.3% from 18 to 24, 29.7% from 25 to 44, 17.3% from 45 to 64, and 6.7% who were 65 years of age or older. The median age was 28 years. For every 100 females, there were 101.2 males. For every 100 females age 18 and over, there were 99.1 males.
The median income for a household in the CDP was $38,731, and the median income for a family was $40,019. Males had a median income of $32,252 versus $23,287 for females. The per capita income for the CDP was $13,912. About 17.2% of families and 20.8% of the population were below the poverty line, including 28.4% of those under age 18 and 8.8% of those age 65 or over.