Rancho Cucamonga is not poor. But it is sure as hell not Newport Beach. I've actually heard someone from Rancho say that it was as expensive to live in Rancho as it is to live in Newport. Rancho is in the desert, it is not on the ocean, so most parts of OC are WAY more expensive, even most of Santa Ana. Income statistics back up my opinion, Rancho is middle to upper middle class, sure as hell not Newport Coast, Palos Verdes, La Jolla, Rancho Santa Fe or Coto de Caza....even if the people there like to pretend they are REALLY rich.
Rancho Cucamonga not Rancho Santa Fe