Monroeville is an unincorporated community located within portions of Elk Township in Gloucester County and Upper Pittsgrove Township in Salem County, in the U.S. state of New Jersey. The area is served as United States Postal Service ZIP Code 08343. Monroeville is mostly filled with wooded areas and farms. Most of the residents attend Upper Pittsgrove School if they are in the Upper Pittsgrove Township portion, although some attend Olivet Elementary in Pittsgrove Township.