The 2016 Morgantown, West Virginia, population is 30,708. There are 3,076 people per square mile (population density). The median age is 23.7. The US median is 37.4. 22.86% of people in Morgantown, West Virginia, are married. 7.34% are divorced. The average household size is 2.33 people. 25.57% of people are married, with children.