IPA: /ˈʌpˌtaʊnər/
KK: /ˈʌpˌtaʊnər/
A person who lives in or comes from the upper part of a city, often associated with wealth or a higher social status.
The uptowner enjoyed shopping in the upscale boutiques downtown.
Uptowner is formed from "up" (meaning higher or above) and "town" (from Old English "tun", meaning an enclosed place or settlement) with the suffix "-er" (meaning a person who). The word refers to a person who lives in or comes from a higher or more affluent area of a town or city.
Think of someone who lives in a 'higher' ('up') part of a 'town' — that's what an uptowner is.