Concordia, New Jersey

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 (County Route 614) and Half Acre Road (CR 615) 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.

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 (part of County Route 615 west of the area).

Clearbrook is a gated community and census-designated place (CDP) located in Monroe Township, Middlesex County, in the U.S. state of New Jersey. It is in the western part of the township, bordered to the north by Encore at Monroe and to the east by Concordia and The Ponds. It is 3.5 miles (5.6 km) southwest of Jamesburg and 5 miles (8 km) northeast of Hightstown. The CDP was named Clearbrook Park in the 2000 and 2010 censuses and renamed in 2020. As of the 2010 United States Census, the CDP's population was 2,667.

Whittingham, also known as Greenbriar at Whittingham, is an unincorporated community and census-designated place (CDP) located within Monroe Township, in Middlesex County, in the U.S. state of New Jersey. As of the 2010 United States Census, the CDP's population was 2,476. The area is focused around the age-restricted gated community of Whittingham.

Encore at Monroe is a gated community and census-designated place (CDP) located in Monroe Township, Middlesex County, in the U.S. state of New Jersey. It is in the western part of the township, bordered to the south by Clearbrook. It is 3 miles (5 km) southwest of Jamesburg, 15 miles (24 km) south of New Brunswick, 6 miles (10 km) northeast of Hightstown, and 18 miles (29 km) northeast of Trenton. The community was first listed as a CDP prior to the 2020 census.

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 had reflected an increase of 11,133 (+39.8%) from the 27,999 counted at the 2000 census. Monroe Township also comprises the largest land area of any municipality in Middlesex County, at approximately 42 square miles (110 km2).Monroe Township was incorporated as a township by an act of the New Jersey Legislature on April 9, 1838, from portions of South Amboy Township, based on the results of a referendum held that same day. Portions of the township were taken to form East Brunswick (February 28, 1860), Cranbury (March 7, 1872), and Jamesburg (March 19, 1887).There are several age-restricted communities in Monroe Township. Despite significant senior citizen population growth, the median age in Monroe has changed from 52.5 in 1990, increasing to 58.9 in 2000, before decreasing to 53.2 in 2010, as more growth recently has resulted from single-family detached homes than from senior citizen developments. Based upon one analysis of data from the FBI's Uniform Crime Report for 2022, Monroe Township was ranked as the safest small city in the United States.

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 (County Route 614) and Applegarth Road (CR 619). 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.The location is the site of the Monroe Oak, a white oak tree present at the time of the township's establishment in 1838. Following the attempted development at the site of the tree to a gas station, the tree has been preserved and became the official symbol of Monroe Township. Prospect Plains was also the site of a railroad station on the Camden & Amboy Railroad, a one-room school house, and was the long-time home of the township's municipal office.

Stonebridge is a gated community and census-designated place (CDP) in Monroe Township, Middlesex County, in the U.S. state of New Jersey. It is in the southwestern part of the township, bordered to the north, across Union Valley Road, by Clearbrook, to the west by Applegarth Road, and to the south by Federal Road. It is 5 miles (8 km) south of Jamesburg and 4 miles (6 km) northeast of Hightstown. The community was first listed as a CDP prior to the 2020 census.

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.

Thompson Park is a 675-acre park and 925-acre nature reservation. The entire park is connected to sports fields operated by Monroe Township High School, and located in the municipalities of Monroe Township and Jamesburg in Middlesex County, New Jersey. It is the largest park in the Middlesex County Park System, and features Lake Manalapan at its center.

Rossmoor is an unincorporated community and census-designated place (CDP) located within Monroe Township in Middlesex County, in the U.S. state of New Jersey. As of the 2010 United States Census, the CDP's population was 2,666.Rossmoor is a gated age-restricted co-op, active adult community . Rossmoor covers 418 acres (1.69 km2) just off Exit 8A of the New Jersey Turnpike (Interstate 95). It has 2,303 residences, encircling a 104-acre (0.42 km2) championship golf course. The community offers a wide selection of living space, from smaller units of 500 sq ft (46 m2), to larger units with 2,300 sq ft (210 m2) of living space, with its architecture primarily being American Colonial in style. Many residents continue to work in the area or commute to New York City. Express buses stop at Rossmoor for the 55-minute ride to the Port Authority Bus Terminal on 42nd Street in Midtown Manhattan.

Gravel Hill or Gravelhill is an unincorporated community located within Monroe Township in Middlesex County, in the U.S. state of New Jersey. Located in a rural part of Monroe Township, the area is made up of approximately half farmland and half forestland. Homes line the roads that run through the area.