Rancho Cucamonga is a city in San Bernardino County, California, United States. As of the 2000 census, the city had a total population of 127,743, but a 2009 estimate by the state of California put the city's population at 177,736 people. In 2006, Money magazine ranked Rancho Cucamonga as the 42nd-best place to live in the United States. 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.