Rancho Cucamonga is located in San Bernardino County, California 37 miles east of Downtown Los Angeles. Rancho Cucamonga is the 7th largest city in the Inland Empire, a large metropolitan area in Southern California comsisting of Riverside and San Bernardino counties, and the 19th largest city in Southern California. In 2019, Rancho Cucamonga has an estimated population of 177,751.
Rancho Cucamonga has a foreign-born population of 20.6%. The city's high Asian population is part of a growing trend across the Inland Empire where Asian-American communities represent the fastest growing group. Growing communities include Cambodians, Laotians, Hmong, Indonesians, and Thai. Filipinos represent the largest Asian community in the Inland Empire.
In the 18th century, the land of Rancho Cucamonga was incorporated into the Mission System under Father Junipero Serra and, after many decades of struggle for control of the region, it eventually came under the control of the governor of Mexico. It was during this time period that Spain's control of much of the region weakened and Mexico won independence, expanding into Baja California and Southern California. In 1839, a large area called Cucamonga was granted to a Spanish native of Los Angeles and smuggler who developed California's first winery on the land. In 1846, American forces entered California and it became a state in 1850 but Southern California was at the time described as a "random collection of adobes." By 1887, irrigation tunnels were created and the Santa Fe Railroad was extended into the region.
Rancho Cucamonga was formed in 1977 when the unincorporated communities of Cucamonga, Alta Loma, and Etiwanda voted to incorporate together.
Rancho Cucamonga has grown rapidly in recent years. Its 2019 population of 177,500 is up about 39% from 2000. In 1980, shortly after incorporating, Rancho Cucamonga had a population of just 55,000 which grew to 101,500 by 1990. The city's steady growth is expected to continue in the next decade as the Inland Empire is expected to grow faster than coastal areas of California.
Rancho Cucamonga, California's estimated population is 177,751 according to the most recent United States census estimates. Rancho Cucamonga, California is the 26th largest city in California based on official 2017 estimates from the US Census Bureau.
The population density is 4444.24 people/mi² (1715.92 people/km²).
The overall median age is 35.5 years, 33.3 years for males, and 37.7 years for females. For every 100 females there are 99.5 males.
Based on data from the American Community Survey, in 2017 there were 58,435 households in the city, with an average size of 3.07 people per household. The homeowner vacancy rate was 1.2%, with a median rent of $1654/month. The median house has 5.6 rooms, and has a value of $444,200.
The median income for households in Rancho Cucamonga, California is $83,736, while the mean household income is $100,140.
According to the most recent ACS, the racial composition of Rancho Cucamonga was:
| Year | Population | Growth | Annual Growth Rate |
| 2018 | 177,751 | 636 | 0.36% |
| 2017 | 177,115 | 1,140 | 0.65% |
| 2016 | 175,975 | 1,608 | 0.92% |
| 2015 | 174,367 | 1,012 | 0.58% |
| 2014 | 173,355 | 2,445 | 1.43% |
| 2013 | 170,910 | 895 | 0.53% |
| 2012 | 170,015 | 2,070 | 1.23% |
| 2011 | 167,945 | 1,713 | 1.03% |
| 2010 | 166,232 | 38,489 | 2.67% |
| 2000 | 127,743 | 26,334 | 2.34% |
| 1990 | 101,409 | 46,159 | 6.26% |
| 1980 | 55,250 | 49,450 | 25.28% |
| 1970 | 5,800 | 1,300 | 2.57% |
| 1960 | 4,500 | 600 | 0.72% |
| 1940 | 3,900 | 0.00% |
| Race | Population | Percentage |
| White | 108,953 | 62.41% |
| Asian | 22,877 | 13.10% |
| Black or African American | 16,289 | 9.33% |
| Some Other Race | 15,997 | 9.16% |
| Two or More Races | 8,697 | 4.98% |
| American Indian and Alaska Native | 1,282 | 0.73% |
| Native Hawaiian and Other Pacific Islander | 478 | 0.27% |
35.5
33.3
37.7
There are 132,849 adults, (18,031 of whom are seniors) in Rancho Cucamonga.
Female
87,516
50.13%
Male
87,057
49.87%
| Type | Count | Average Size | Owned |
| All | 55,870 | 3.07 | 61.3 |
| Married | 30,867 | 3.71 | 73.1 |
| Non Family | 13,901 | 1.3 | 47.5 |
| Female | 7,608 | 3.47 | 45.1 |
| Male | 3,494 | 3.55 | 47.7 |
| Education Attained | Count | Percentage |
| Less Than 9th Grade | 3,802 | 3.31% |
| 9th to 12th Grade | 5,931 | 5.17% |
| High School Graduate | 23,225 | 20.24% |
| Some College | 30,431 | 26.52% |
| Associates Degree | 12,515 | 10.91% |
| Bachelors Degree | 24,283 | 21.16% |
| Graduate Degree | 14,554 | 12.68% |
The highest rate of high school graduation is among islander people with a rate of 97.78%.
The highest rate of bachelors degrees is among asian people with a rate of 56.45%.
$47,163
Average Earnings
$55,957
Average Male
$39,006
Average Female
67.13% of Rancho Cucamonga residents speak only English, while 32.87% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 18.72% of the population.
| Name | Total | In Poverty | Poverty Rate |
| Hispanic | 63,731 | 6,031 | 9.46% |
| White | 64,707 | 4,320 | 6.68% |
| Asian | 22,829 | 1,915 | 8.39% |
| Black | 15,582 | 1,869 | 11.99% |
| Other | 15,153 | 1,720 | 11.35% |
| Multiple | 8,639 | 693 | 8.02% |
| Native | 1,183 | 143 | 12.09% |
| Islander | 478 | 52 | 10.88% |
8.45%
Overall Poverty Rate
7.24%
Male Poverty Rate
9.62%
Female Poverty Rate
The race most likely to be in poverty in Rancho Cucamonga is Native, with 12.09% below the poverty level.
The race least likely to be in poverty in Rancho Cucamonga is White, with 6.68% below the poverty level.
The poverty rate among those that worked full-time for the past 12 months was 1.33%. Among those working part-time, it was 9.56%, and for those that did not work, the poverty rate was 14.39%.
49.4%
Overall Marriage Rate
50.7%
Male Marriage Rate
48.2%
Female Marriage Rate
The age group where males are most likely to be married is 55-64, while the female age group most likely to be married is 45-54.
| Name | Veterans | % of Total |
| White | 5,543 | 6.54% |
| Hispanic | 2,059 | 4.39% |
| Black | 716 | 5.71% |
| Other | 582 | 4.57% |
| Asian | 273 | 1.60% |
| 2 or More | 205 | 4.45% |
| Indian | 51 | 6.98% |
| Hawaiian | 31 | 7.73% |
2.97%
Veteran Poverty Rate
22.64%
Veteran Disability Rate
66.4%
Labor Force Participation
61.5%
Employment Rate
7.3%
Unemployment Rate
Non citizens include legal permanent residents (green card holders), international students, temporary workers, humanitarian migrants, and illegal immigrants.
79.36%
Native Born
20.64%
Foreign Born
7.96%
Non Citizen
79.36% of Rancho Cucamonga residents were born in the United States, with 62.87% having been born in California. 7.96% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Asia.