where is rancho cucamonga

Rancho Cucamonga is a city in southern California, in San Bernardino County, about 37 miles (around 60 km) east of downtown Los Angeles, along the southern foothills of the San Gabriel Mountains.

It sits in the Inland Empire region and is bordered by Upland to the west, Ontario to the south, the San Gabriel Mountains to the north, and the Fontana/I‑15 corridor to the east.