Zelienople is a city located in Butler County Pennsylvania. With a 2020 population of 3,549, it is the 273rd largest city in Pennsylvania and the 5742nd largest city in the United States . Zelienople is currently declining at a rate of -0.76% annually and its population has decreased by -6.90% since the most recent census, which recorded a population of 3,812 in 2010. Zelienople reached it's highest population of in . Spanning over 2 miles, Zelienople has a population density of 1,732 people per square mile.
The average household income in Zelienople is $78,170 with a poverty rate of 6.07%. The median rental costs in recent years comes to $1,094 per month, and the median house value is $201,400. The median age in Zelienople is 48.9 years, 42.5 years for males, and 51.5 years for females.