Monroe Township is a township located in southern Middlesex County, in the U.S. state of New Jersey. The township is centrally located within the Raritan Valley region and is an outer-ring suburb of New York City within the New York metropolitan area. As of the 2020 United States census, the township's population was 48,594, its highest decennial count ever and an increase of 9,462 (+24.2%) from the 39,132 recorded at the 2010 census, which in turn reflected an increase of 11,133 (+39.8%) from the 27,999 counted in the 2000 census. Monroe Township also comprises the largest land area of any municipality in Middlesex County, at approximately 42 square miles (110 km2).
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.
Holmeson is an unincorporated community located within Millstone Township in Monmouth County, in the U.S. state of New Jersey. As it is located along County Route 537 through which the Monmouth–Ocean county line runs down the center, portions of the community are also located in Jackson Township. Owing to its location near Interstate 195 and Six Flags Great Adventure, the community is mostly made up of gas stations, restaurants, and small businesses though the Jackson Premium Outlets occupies land just south of the community.
Applegarth is an unincorporated community located within Monroe Township in Middlesex County, in the U.S. state of New Jersey. The settlement is located in the southern portion of the township and is traversed by the road of the same name, Applegarth Road. At the location of the original settlement, at the intersection of Applegarth, Wycoffs Mills, and Old Church Roads, there is a restaurant, farmland, and the Applegarth Fire Department. Further north along Applegarth Road are housing developments, age-restricted communities, and two elementary schools: Applegarth and Oak Tree.
Prospertown is an unincorporated community located within the New Jersey townships of Jackson and Plumsted in Ocean County and Upper Freehold in Monmouth County. The community is home to Prospertown Lake and is adjacent to Six Flags Great Adventure, both located on County Route 537. The center of the community is located at the intersection of CR 537, Hawkin Road, and Emleys Hill Road. Most of the area consists of pine forests but there are some homes along the roads in the area.
Chapel Hill is an unincorporated community located within Middletown Township, in Monmouth County, in the U.S. state of New Jersey. As its name implies, the area is on a high spot within the township between Fairview and Leonardo just south of the Naval Weapons Station Earle Waterfront Section. Unlike other areas of Middletown Township, the Chapel Hill section is not as developed with single-family homes; only a few housing developments are located off the area's main roads, Kings Highway and Chapel Hill Road. The rest of the area outside NWS Earle consists of horse farms and forestland.
Cranbury Station is an unincorporated community located within Cranbury Township in Middlesex County, in the U.S. state of New Jersey. The area immediately around the site of the former railroad station along the Camden and Amboy Railroad contains agricultural businesses and small homes. Hightstown-Cranbury Station Road is the main road through the settlement paralleling the railroad and Station Road as a major road heading east and west through the area. Modern warehouses line Station Road and the nearby New Jersey Turnpike west of the station while large housing developments are located east of here in Monroe Township.
Hoffman is an unincorporated community located within Monroe Township in Middlesex County, in the U.S. state of New Jersey. The settlement is located at the site of a former railroad station on the Freehold and Jamesburg Agricultural Railroad. Today, most of the area is made up of homes and housing developments along Hoffman Station Road and Gravel Hill-Spotswood Road. Forestland and the Manalapan Brook valley make up the remainder of the area.
Half Acre is an unincorporated community located within Monroe Township in Middlesex County, in the U.S. state of New Jersey. The settlement is located roughly at the intersection of Prospect Plains Road and Half Acre Road in the center of the township. Some single-family homes and small businesses are located along those two roads and Cranbury-Half Acre Road but most of the area is made up of age-restricted housing developments including Concordia, Clearbrook Park, Greenbriar at Whittingham, and Encore at Monroe.
Middlesex Downs is an unincorporated community located within Monroe Township in Middlesex County, in the U.S. state of New Jersey. The wholly residential settlement contains small homes along Dey Grove Road and Bergen Mills Road with larger homes in developments towards the south. The township-owned James Monroe Memorial Park is also located in this settlement. Much of the area to the north of Dey Grove Road consists of forest land but at one time this was planned to become a large planned community arranged in a street grid. The small property parcels and paper streets remain on township tax maps today.
Prospect Plains is an unincorporated community located within Monroe Township in Middlesex County, in the U.S. state of New Jersey. The settlement is located at the intersection of Prospect Plains Road and Applegarth Road. Retail businesses generally line the two aforementioned county roads in the area but some single-family houses are clustered around the site of the Camden & Amboy railroad crossing of Prospect Plains Road.
Shore Road Estates is an unincorporated community located within Monroe Township in Middlesex County, in the U.S. state of New Jersey.
Spotswood Manor is an unincorporated community located within Monroe Township in Middlesex County, in the U.S. state of New Jersey. The settlement is located just south of the borough of Spotswood, most of them consist of small homes, though businesses and strip malls line Spotswood-Englishtown Road, the main road through the area.
Tracy is an unincorporated community located within Monroe Township in Middlesex County, in the U.S. state of New Jersey. The settlement is located at the site of a former station on the Freehold and Jamesburg Agricultural Railroad in the southeastern edge of the township. Most of the area is forestland with some homes and light commercial businesses located along Federal Road and Tracy Station Road.
Union Valley is an unincorporated community located within Monroe Township in Middlesex County, in the U.S. state of New Jersey. Two large age-restricted communities lie within the settlement today, Clearbrook Park and Concordia. Other than those two communities, the only other buildings in the area are medical offices and facilities and some single-family homes along Union Valley Road.
Wyckoffs Mills is an unincorporated community located along the border of Cranbury and Monroe townships in Middlesex County, in the U.S. state of New Jersey. Located at the intersection of Wyckoff Mills Road and Wyckoffs Mills Road, the area only contains lots containing residential structures; the remainder of the land is made up of farmland and wetlands. The Millstone River flows to the south of the settlement and a 500-kilovolt transmission line crosses the farmland to the north and south.
Ardena is an unincorporated community located within Howell Township in Monmouth County, in the U.S. state of New Jersey. The community is located along County Route 524 near Vanderveer Road in the western part of the township. The area consists of about half farmland and half residential developments.
Bergerville is an unincorporated community located within Howell Township in Monmouth County, in the U.S. state of New Jersey. The area was originally developed as a resort bungalow community in the first half of the 20th century.
Old Church is an unincorporated community located within Monroe Township in Middlesex County, in the U.S. state of New Jersey. The settlement is named for a Presbyterian community that settled on the site but relocated to Cranbury c. 1740. Originally, the area was farmland. One of the farms in the area was the Dey Farm, in existence since the founding of Monroe Township in 1838 and the site of a command post used by George Washington during the Battle of Monmouth in 1778. Starting in 2004, the area experienced a major change from its agricultural roots to single-family residences on the south side of the area and age-restricted communities to the north. This redevelopment also caused the severing of the main north–south road, Old Church Road and the extension of Federal Road which formerly had its western end at Old Church Road to Applegarth Road. The a farmhouse named England House was moved 4,000 feet (1,200 m) to the Dey Farm site to preserve the area's history prior to the construction of the new houses in 2004.
United States 
New Jersey 
