Killen is a city located in Lauderdale County Alabama. With a 2020 population of 951, it is the 262nd largest city in Alabama and the 10521st largest city in the United States . Killen is currently declining at a rate of -0.21% annually and its population has decreased by -14.17% since the most recent census, which recorded a population of 1,108 in 2010. Killen reached it's highest population of 995 in 2010. Spanning over 2 miles, Killen has a population density of 470 people per square mile.
The average household income in Killen is $64,608 with a poverty rate of 9.37%. The median rental costs in recent years comes to $781 per month, and the median house value is $138,100. The median age in Killen is 39.1 years, 38.2 years for males, and 39.3 years for females.