Upper Montclair is a census-designated place, unincorporated community and neighborhood within Montclair in Essex County, in the U.S. state of New Jersey. As of the 2010 United States Census, the population for the CDP was 11,565. The area is served as United States Postal Service ZIP Code 07043. It is often misperceived, even by Montclair residents, to …Upper Montclair is a census-designated place, unincorporated community and neighborhood within Montclair in Essex County, in the U.S. state of New Jersey. As of the 2010 United States Census, the population for the CDP was 11,565. 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.
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