Lock Haven is a city located in Clinton County Pennsylvania. It is also the county seat of Clinton County. With a 2020 population of 9,041, it is the 77th largest city in Pennsylvania and the 3309th largest city in the United States . Lock Haven is currently declining at a rate of -0.23% annually and its population has decreased by -7.48% since the most recent census, which recorded a population of 9,772 in 2010. Lock Haven reached it's highest population of in . Spanning over 3 miles, Lock Haven has a population density of 3,622 people per square mile.
The average household income in Lock Haven is $47,112 with a poverty rate of 32.72%. The median rental costs in recent years comes to $747 per month, and the median house value is $104,500. The median age in Lock Haven is 25.2 years, 25 years for males, and 25.4 years for females.