San Marcos, sort of (unincorporated, really). Vista is further north-west from Escondido. Basically, if you go directly east from Vista you might hit the northern most parts of San Marcos and later Escondido in hidden-valley, but it is mostly Valley center east of Vista.Would that put you in Vista then?
My son is in Poway.
That 78 sink hole sure messed up the traffic down there something fierce.