| Official Name: | Robertsville, New Jersey |
| Settlement Type: | Census-designated place |
| Pushpin Map: | USA New Jersey Monmouth County#USA New Jersey#USA |
| Pushpin Label: | Robertsville |
| Pushpin Map Caption: | Location in Monmouth County##Location in New Jersey##Location in the United States |
| Pushpin Relief: | yes |
| Subdivision Type: | Country |
| Subdivision Name: |  United States |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Monmouth |
| Subdivision Type3: | Township |
| Subdivision Name3: | Marlboro |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 15.32 |
| Area Land Km2: | 15.29 |
| Area Water Km2: | 0.03 |
| Area Total Sq Mi: | 5.91 |
| Area Land Sq Mi: | 5.90 |
| Area Water Sq Mi: | 0.01 |
| Area Water Percent: | 0.21 |
| Population As Of: | 2020 |
| Population Total: | 11399 |
| Population Density Km2: | 745.61 |
| Population Density Sq Mi: | 1931.05 |
| Timezone: | Eastern (EST) |
| Utc Offset: | −05:00 |
| Timezone Dst: | Eastern (EDT) |
| Utc Offset Dst: | −04:00 |
| Elevation Footnotes: | [2] |
| Elevation M: | 50 |
| Elevation Ft: | 164 |
| Coordinates: | 40.3388°N -74.2944°W |
| Postal Code Type: | ZIP Codes |
| Postal Code: | 07726 (Englishtown) 07746 (Marlboro) 07751 (Morganville) |
| Area Code: | 732/848 |
| Blank Name: | FIPS code |
| Blank Info: | [3] [4] [5] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 02634200[6] |
Robertsville is a census-designated place and unincorporated community in Marlboro Township, Monmouth County, in the U.S. state of New Jersey.[7] [8] [9] As of the 2020 census, the CDP's population was 11,399.
Robertsville is in northern Monmouth County, in the western corner of Marlboro Township. It is bordered to the southwest by Manalapan Township and to the northwest by Old Bridge Township in Middlesex County. U.S. Route 9 passes through the west side of the community, leading south 6miles to Freehold Borough, the Monmouth county seat, and north 9miles to South Amboy. The New Jersey Route 18 expressway runs along the eastern side of Robertsville, with access to the community from Exit 29 (Tennent Road). Route 18 leads northwest to New Brunswick and southeast to the Garden State Parkway at Tinton Falls.
According to the United States Census Bureau, the Robertsville CDP has a total area of 5.915sqmi, including 5.903sqmi of land and 0.012sqmi of water (0.20%).[1]
At the 2010 census, there were 11,297 people, 3,792 households, and 3,230.784 families living in the CDP. The population density was . There were 3,941 housing units at an average density of . The racial makeup of the CDP was 84.21% (9,513) White, 2.39% (270) Black or African American, 0.03% (3) Native American, 11.7% (1,324) Asian, 0.01% (1) Pacific Islander, 0.59% (67) from other races, and 1.05% (119) from two or more races. Hispanic or Latino of any race were 4.05% (458) of the population.
Of the 3,792 households 42.4% had children under the age of 18 living with them, 77.3% were married couples living together, 6.0% had a female householder with no husband present, and 14.8% were non-families. 13.0% of households were made up of individuals, and 7.1% were one person aged 65 or older. The average household size was 2.98 and the average family size was 3.27.
The age distribution was 27.0% under the age of 18, 6.3% from 18 to 24, 20.2% from 25 to 44, 33.7% from 45 to 64, and 12.7% 65 or older. The median age was 42.8 years. For every 100 females there were 95.3 males. For every 100 females ages 18 and older there were 92.3 males.
Children residing in the Robertsville area in public school attend Robertsville Elementary School, as part of the Marlboro Township Public School District.
Tennent Road (County Route 3), Newman Springs Road (County Route 520), U.S. Route 9, and the Route 18 freeway travel through Robertsville.