text: There were 6,030 households, out of which 19.8% had children under the age of 18 living with them, 38.6% were married couples living together, 8.3% had a female householder with no husband present, and 49.6% were non-families. 25.7% of all households were made up of individuals, and 9.1% had someone living alone who was 65 years of age or older. The average household size was 2.65 and the average family size was 3.11.
  In the city, 10.5% of the population was under the age of 18, 51.3% was between from 18 to 24, 19.8% from 25 to 44, 11.3% from 45 to 64, and 7.2% were 65 years of age or older. The median age was 22 years. For every 100 females, there were 110.3 males. For every 100 females age 18 and over, there were 111.2 males.
  Economy
  The University of Maryland shapes College Park's economy significantly, contributing to over half of the city's total employment and a significant fraction of its population. In 2017 the university rebranded its 150-acre business and research park as the Discovery district aiming to bring together research firms, start-ups and shops and restaurants. This area is divided between College Park and Riverdale Park.
  This Discovery district is home to federal agencies such as the NOAA's Weather Prediction Center, the FDA's Center for Food Safety and Applied Nutrition (CFSAN), and the navy's software factory (the Forge), as well as university centers such as the Applied Research Laboratory for Intelligence and Security (ARLIS) sponsored by the Department of Defense.