Alta Loma is one of three formerly unincorporated areas that became part of the city of Rancho Cucamonga, California, United States in 1977. The community is located in the foothills of the south face of the San Gabriel Mountain range, near Cucamonga Peak and Mount Baldy. It is located in the 91701 and 91737 zip codes. The latitude of Alta Loma is 34.122N. The longitude is -117.597W. Its lowest elevation is approximately 1,371 feet and extends to about 3000 feet. The name comes from the Spanish, meaning "high hill." Alta Loma had previously been known as Iamosa.
Alta Loma is one of the more affluent areas in San Bernardino County. It is almost completely residential and as per city ordinance no commercial business may exist above 19th Street, with exception to several businesses already in place when the ordinance was enacted (notably at the intersection of Lemon Avenue and Haven Avenue). In addition, homes north of Banyan Road must have a minimum of 1/2 acre lots, with the exception of the development known as Compass Rose Phase II found directly west of Chaffey College between Banyan and Wilson.
The community of Alta Loma is located mostly in the northwest corner of Rancho Cucamonga. The exact definitions of the three communities (Cucamonga, Etiwanda, and Alta Loma) within the City of Rancho Cucamonga are debatable; however, residents typically consider Alta Loma to be above Baseline Street (Old Route 60), between the eastern edge of Upland, California and west of Day Creek, a boundary later moved to Day Creek Boulevard when the then-future road was plotted on Chamber of Commerce maps dating to about 1980. Most street signs in the Rancho Cucamonga area stretching from Carnelian Street to Milliken Avenue, and Baseline Road to the mountains, have an Alta Loma logo.
Alta Loma Demographics
Alta Loma Crime Statistics
Alta Loma History
Alta Loma City Calendar
City of Rancho Cucamonga
Alta Loma School District
Rancho Cucamonga Chanber of Commerce