 The city of Lock Haven is the county seat of Clinton County , in the U.S. state of Pennsylvania . Located near the confluence of the West Branch Susquehanna River and Bald Eagle Creek , it is the principal city of the Lock Haven Micropolitan Statistical Area , itself part of the Williamsport – Lock Haven combined statistical area . At the 2010 census , Lock Haven 's population was 9 @,@ 772 . 
 The city of Lock Haven <a href='drop_aux' title='1'><mark>is</mark></a>the county seat of Clinton County , in the U.S. state of Pennsylvania . Located near the confluence of the West Branch Susquehanna River and Bald Eagle Creek , it <a href='drop_aux' title='2'><mark>is</mark></a>the principal city of the Lock Haven Micropolitan Statistical Area , itself part of the Williamsport – Lock Haven combined statistical area . At the 2010 census , Lock Haven <a href='null_genetive' title='3'><mark>'s</mark></a>population was 9 @,@ 772 . 
Da city of Lock Haven the county seat of Clinton County , in tdaU.S. state of Pennsylvania . Located near thdaonfluence of thedast Branch Susquehanna River and Bald Eagle Creek , it the principal city of the Lock Haven Micropolitan Statistical Area , itself part of the daliamsport – Lock Haven combined statistical area . At the 2da census , Lock Haven  population was 9 @,@ 772 .