Middle River is an unincorporated community and census-designated place in Baltimore County, Maryland, United States. The population was 25,191 at the 2010 census. A Middle River Train Station first appeared on the 1877 G.M. Hopkins & Co Baltimore County Map and by 1898 had a designated Post Office and modest street grid. The town expanded during the 1930s and 1940s and established the “Aero Acres” housing community which borders the railroad tracks and Martin Blvd. to serve as housing for people working at the Martin Aerospace Company.
Middle River is located at 39°20′2″N 76°26′26″W / 39.33389°N 76.44056°W / 39.33389; -76.44056 (39.333957, −76.440502).
According to the United States Census Bureau, the Census Designated Place (CDP) has a total area of 8.5 square miles (22 km), of which 7.7 square miles (20 km) is land and 0.7 square miles (1.8 km), or 8.63%, is water.
As of the census of 2000, there were 23,958 people, 9,425 households, and 6,399 families residing in the CDP. The population density was 3,100.8 people per square mile (1,196.7/km²). There were 10,000 housing units at an average density of 1,294.3 per square mile (499.5/km²). The racial makeup of the CDP was 82.60% White, 13.21% African American, 0.60% Native American, 1.23% Asian, 0.03% Pacific Islander, 0.86% from other races, and 1.47% from two or more races. Hispanic or Latino of any race were 1.92% of the population.
There were 9,425 households out of which 33.1% had children under the age of 18 living with them, 46.0% were married couples living together, 16.1% had a female householder with no husband present, and 32.1% were non-families. 25.7% of all households were made up of individuals and 9.8% had someone living alone who was 65 years of age or older. The average household size was 2.51 and the average family size was 2.99.
In the CDP, the population was spread out with 25.9% under the age of 18, 8.0% from 18 to 24, 30.7% from 25 to 44, 22.2% from 45 to 64, and 13.1% who were 65 years of age or older. The median age was 36 years. For every 100 females, there were 91.1 males. For every 100 females age 18 and over, there were 87.0 males.