North Middletown is an unincorporated community and census-designated place (CDP) within Middletown Township, in Monmouth County, New Jersey, United States. As of the 2010 United States Census, the CDP's population was 3,295.
East Keansburg was renamed North Middletown by municipal ordinance around 1988.
According to the United States Census Bureau, North Middletown had a total area of 0.434 square miles (1.124 km2), all of which was land.
The 2010 United States Census counted 3,295 people, 1,142 households, and 859 families in the CDP. The population density was 7,593.9 inhabitants per square mile (2,932.0/km2). There were 1,203 housing units at an average density of 2,772.5 per square mile (1,070.5/km2). The racial makeup was 90.77% (2,991) White, 1.82% (60) Black or African American, 0.21% (7) Native American, 2.61% (86) Asian, 0.03% (1) Pacific Islander, 2.03% (67) from other races, and 2.52% (83) from two or more races. Hispanic or Latino of any race were 9.62% (317) of the population.
Of the 1,142 households, 36.2% had children under the age of 18; 54.1% were married couples living together; 15.6% had a female householder with no husband present and 24.8% were non-families. Of all households, 18.0% were made up of individuals and 5.2% had someone living alone who was 65 years of age or older. The average household size was 2.89 and the average family size was 3.30.
23.9% of the population were under the age of 18, 10.0% from 18 to 24, 31.1% from 25 to 44, 27.9% from 45 to 64, and 7.1% who were 65 years of age or older. The median age was 34.8 years. For every 100 females, the population had 95.5 males. For every 100 females ages 18 and older there were 92.4 males.
At the 2000 United States Census there were 3,165 people, 1,026 households and 819 families living in the CDP. The population density was 6,879.6 per square mile (2,656.6/km2).