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Upper Montclair is a census-designated place (CDP), unincorporated community and neighborhood within Montclair in Essex County, in the U.S. state of New Jersey. As of the 2020 census, Upper Montclair had a population of 13,146. The area is served as United States Postal Service ZIP Code 07043. It is often misperceived, even by Montclair residents, to be a separate municipality from Montclair, perhaps aided by this postal designation.