I have a friend who retired as a Principal in the Cucamonga School District (the district is old enough they don't have the Rancho prefix). He never once called it Rancho, it was always just "Cucamonga", or sometimes more formally "Rancho Cucamonga".
And friends of mine who retired in Rancho Mirage, and throw fabulous parties with Rancho Mirage neighbors, have never uttered the single word "Rancho" without following it immediately by "Mirage".
The issue with calling that one city just "Rancho" becomes quickly, what do you do with Rancho Palos Verdes, or Rancho Santa Margarita, or Rancho Cordova, or Rancho Murieta, or Rancho Santa Fe, or Rancho Bernardo, etc., etc.???
I like Las as a contrast. Or Los. Also San.
"I'm going to take the train from Los to San, but Carol is taking a plane from Las to San, with a plane change in Los. It was either that, or she could get a direct flight from Las to San but then have to rent a car in San to drive up to meet us in San. Her Loss."
Boys, could you take it from here? Cause I'd like to ask my friend
@Parteecia to dance...