Rosenhayn is an unincorporated community and census-designated place (CDP) located within Deerfield Township, in Cumberland County, New Jersey, United States. It is part of the Vineland-Millville- Bridgeton Primary Metropolitan Statistical Area for statistical purposes. As of the 2010 United States Census, the CDP's population was 1,098.
Rosenhayn was founded as a Jewish agricultural colony and the 1898 Rosenhayn synagogue is one of the fewer than 100 surviving nineteenth century synagogue buildings in the United States.
According to the United States Census Bureau, the CDP had a total area of 2.654 square miles (6.874 km2), all land.
The 2010 United States Census counted 1,098 people, 382 households, and 273.894 families in the CDP. The population density was 413.7 per square mile (159.7/km2). There were 404 housing units at an average density of 152.2 per square mile (58.8/km2). The racial makeup was 64.21% (705) White, 18.03% (198) Black or African American, 1.28% (14) Native American, 1.46% (16) Asian, 0.00% (0) Pacific Islander, 9.29% (102) from other races, and 5.74% (63) from two or more races. Hispanic or Latino of any race were 17.58% (193) of the population.
Of the 382 households, 34.8% had children under the age of 18; 51.0% were married couples living together; 16.2% had a female householder with no husband present and 28.3% were non-families. Of all households, 23.0% were made up of individuals and 10.5% had someone living alone who was 65 years of age or older. The average household size was 2.86 and the average family size was 3.36.
26.5% of the population were under the age of 18, 9.6% from 18 to 24, 24.8% from 25 to 44, 27.0% from 45 to 64, and 12.2% who were 65 years of age or older. The median age was 37.1 years. For every 100 females, the population had 98.2 males.