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is a city in San Bernardino County, California, United States. As of the 2000 census, the city had a total population of 127,743. By July 1, 2002 Census the fast-growing city's population had reached 143,711. By 2008, the city's estimated population had reached 174,308 people. In 2006,
Dr. Donald J. Kurth was elected as mayor on November 7, 2006. Jack Lam is the city manager.
The city was incorporated in 1977, as a result of a merger among the unincorporated communities of Alta Loma, Cucamonga, and Etiwanda.
Rancho Cucamonga is located at (34.123345, -117.579404), or about east of Los Angeles.
According to the United States Census Bureau, the city has a total area of 97.0 km² (37.5 mi²). 97.0 km² (37.5 mi²) of it is land and 0.03% is water.
Rancho Cucamonga is the conjunction of the Mojave Trail, the Old Spanish Trail, the Santa Fe Trail, former U.S. Route 66 (now signed as Foothill Boulevard), and El Camino Real.
Rancho Cucamonga's location (right next to the San Gabriel Mountains) causes the city to be very smoggy.