Monroeville is an unincorporated area located within portions of Elk Township in Gloucester County and Upper Pittsgrove Township in Salem County, New Jersey, United States. The area is served as United States Postal Service ZIP Code 08343. The Area is used as the mailing address for its residents. Most of the residents attend Upper Pittsgrove School if they are on the Upper Pittsgrove Township portion, although some attend Olivett Elementary in Pittsgrove Township. The Area Code is 856. Monroeville is mostly filled with wooded areas and farms, it is not densely populated although it is a friendly place to live. It is mainly considered a region of Upper Pittsgrove Township, differentiated by the postal zip code (08343). As of the United States 2000 Census, the population for ZIP Code Tabulation Area 08343 was 4,596. Fun Fact: At the intersection of Glassboro Road and US. Rt. 77, the large tree that was blocking the view on the East side, has been cut down, as of 2007.