Concordia, New Jersey

Concordia is an unincorporated community and census-designated place (CDP) in Monroe Township, Middlesex County, New Jersey, United States. The CDP is oriented around the age restricted gated community of Concordia. As of the 2020 United States census, the CDP's population was 2,455, down from 3,092 in 2010. Prior to 2020, the corner of Concordia known as The Ponds was split off into its own CDP.

Geography
Concordia is in southern Middlesex County, in west-central Monroe Township. It is bordered to the north by Wittingham, to the southwest by The Ponds, and to the west by Clearbrook. Jamesburg, the closest borough, is 3 mi to the north, while Hightstown is 6 mi to the southwest.

According to the U.S. Census Bureau, the CDP has a total area of 0.791 mi2, including 0.770 mi2 of land and 0.021 mi2 of water (2.65%).

2010 census
The 2010 United States census counted 3,092 people, 2,032 households, and 923 families in the CDP. The population density was 2975.3 /mi2. There were 2,261 housing units at an average density of 2175.7 /mi2. The racial makeup was 96.35% (2,979) White, 2.20% (68) Black or African American, 0.00% (0) Native American, 1.10% (34) Asian, 0.00% (0) Pacific Islander, 0.03% (1) from other races, and 0.32% (10) from two or more races. Hispanic or Latino of any race were 1.42% (44) of the population.

Of the 2,032 households, 0.1% had children under the age of 18; 43.4% were married couples living together; 1.7% had a female householder with no husband present and 54.6% were non-families. Of all households, 50.1% were made up of individuals and 44.0% had someone living alone who was 65 years of age or older. The average household size was 1.52 and the average family size was 2.04.

0.2% of the population were under the age of 18, 0.4% from 18 to 24, 1.0% from 25 to 44, 14.9% from 45 to 64, and 83.6% who were 65 years of age or older. The median age was 78.7 years. For every 100 females, the population had 60.7 males. For every 100 females ages 18 and older there were 60.7 males.

2000 census
As of the 2000 United States Census there were 3,658 people, 2,180 households, and 1,351 families living in the CDP. The population density was 1,345.1 /km2. There were 2,341 housing units at an average density of 860.8 /km2. The racial makeup of the CDP was 98.74% White, 0.52% African American, 0.46% Asian, 0.05% from other races, and 0.22% from two or more races. Hispanic or Latino of any race were 0.33% of the population.

There were 2,180 households, out of which 0.2% had children under the age of 18 living with them, 60.5% were married couples living together, 1.2% had a female householder with no husband present, and 38.0% were non-families. 35.4% of all households were made up of individuals, and 33.3% had someone living alone who was 65 years of age or older. The average household size was 1.68 and the average family size was 2.05.

In the CDP the population was spread out, with 0.4% under the age of 18, 0.1% from 18 to 24, 1.0% from 25 to 44, 10.1% from 45 to 64, and 88.5% who were 65 years of age or older. The median age was 74 years. For every 100 females, there were 72.5 males. For every 100 females age 18 and over, there were 72.3 males.

The median income for a household in the CDP was $43,382, and the median income for a family was $51,949. Males had a median income of $54,615 versus $32,250 for females. The per capita income for the CDP was $36,962. About 0.9% of families and 1.9% of the population were below the poverty line, including none of those under age 18 and 2.2% of those age 65 or over.