Elkridge is an unincorporated community and census-designated place (CDP) in Howard County, Maryland, United States. The population was 15,593 at the 2010 census. Founded early in the 18th century, Elkridge is located at the confluence of three counties, the other two being Anne Arundel and Baltimore counties.
Elkridge is located in the eastern corner of Howard County at 39°12′7″N 76°45′1″W / 39.20194°N 76.75028°W / 39.20194; -76.75028 (39.202057, −76.750157). It is bordered to the north by Ilchester, to the northwest by Columbia, to the southwest by Jessup, to the southeast by Anne Arundel County, and to the northeast, across the Patapsco River, by Halethorpe (part of the Arbutus CDP) in Baltimore County.
According to the United States Census Bureau, the CDP has a total area of 8.4 square miles (21.8 km), of which 0.01 square miles (0.03 km), or 0.12%, is water.
As of the census of 2000, there were 22,042 people, 8,324 households, and 5,793 families residing in the CDP. The population density was 2,799.9 people per square mile (1,081.4/km²). There were 8,719 housing units at an average density of 1,107.5 per square mile (427.8/km²). The racial makeup of the CDP was 80.58% White, 9.59% African American, 0.21% Native American, 6.47% Asian, 0.03% Pacific Islander, 0.95% from other races, and 2.16% from two or more races. Hispanic or Latino of any race were 2.22% of the population.
There were 8,324 households out of which 42.0% had children under the age of 18 living with them, 55.6% were married couples living together, 10.5% had a female householder with no husband present, and 30.4% were non-families. 22.5% of all households were made up of individuals and 4.1% had someone living alone who was 65 years of age or older. The average household size was 2.64 and the average family size was 3.16.
In the CDP, the population was spread out with 29.2% under the age of 18, 6.0% from 18 to 24, 44.4% from 25 to 44, 15.3% from 45 to 64, and 5.2% who were 65 years of age or older. The median age was 32 years. For every 100 females, there were 95.5 males. For every 100 females age 18 and over, there were 91.9 males.
The median income for a household in the CDP was $65,835, and the median income for a family was $71,923. Males had a median income of $47,329 versus $35,802 for females. The per capita income for the CDP was $27,629. About 2.0% of families and 2.7% of the population were below the poverty line, including 2.9% of those under age 18 and 5.5% of those age 65 or over.