 The Keystone Central School District serves most of Clinton County , including Lock Haven , as well as parts of Centre County and Potter County . The district 's administration building is in Lock Haven as are three of the district 's elementary schools , Dickey Elementary , Robb Elementary , and Woodward Elementary , all for children enrolled in kindergarten through fifth grade . The total enrollment of these three schools combined in 2002 – 03 was 790 . Central Mountain Middle School in Mill Hall is the nearest public middle school , for grades six to eight . The nearest public high school , grades nine to twelve , is Central Mountain High School , also in Mill Hall . 
 The Keystone Central School District <a href='uninflect' title='1'><mark>serves</mark></a> most of Clinton County , including Lock Haven , as well as parts of Centre County and Potter County . The district <a href='null_genetive' title='2'><mark>'s</mark></a>administration building is in Lock Haven as <a href='drop_aux' title='3'><mark>are</mark></a>three of the district <a href='null_genetive' title='4'><mark>'s</mark></a>elementary schools , Dickey Elementary , Robb Elementary , and Woodward Elementary , all for children enrolled in kindergarten through fifth grade . The total enrollment of these three schools combined in 2002 – 03 was 790 . Central Mountain Middle School in Mill Hall <a href='drop_aux' title='5'><mark>is</mark></a>the nearest public middle school , for grades six to eight . The nearest public high school , <a href='uninflect' title='6'><mark>grades</mark></a> nine to twelve , is Central Mountain High School , also in Mill Hall . 
Da Keystone Central skoo District serve most of Clinton County , including Lock Haven , as well as parts of Centre County and Potter County . Tdadistrict  administration building is in Lock Haven as three of thdaistrict  elementary schools , Dickey Elementary , Robb Elementary , and Woodward Elementary , all for children enrolled in kindergarten through fifth grade . The total enrollment of these three schools combined in 2002 – 03 was 790 . Central Mountain Middle Scskoon Mill Hall the nearest public middle school , fir grades six to eight . The nearest public high schoskoolrade nine to twelve , is Central Mountain High School , also in Mill Hall .