|Country||United States of America|
|Elevation||817 ft (249 m)|
Karns is an unincorporated community in Harrison Township, Allegheny County, Pennsylvania, USA; it is located in Western Pennsylvania within the Pittsburgh Metropolitan Statistical Area, approximately 24 miles (39 km) northeast of Pittsburgh. Karns is situated along the Allegheny River at Pool 4 across from Jacks Island just above Lock and Dam 4 between Natrona, Natrona Heights, and Sligo. The elevation of Karns is 817 feet above sea level.
The community is located within the Highlands School District. Highlands High School and Highlands Middle School are located in Natrona Heights. Air pollution levels (particularly chromium) measured in Karns area schools are among the worst in the United States.
- "Karns". Geographic Names Information System. 2009. Retrieved 2009-12-02.
- "Lock and Dam 4". Retrieved 2009-01-30.
- Sipes, William B. (1875). The Pennsylvania Railroad: Its Origin, Construction, Condition, and Connections; Embracing Historical, Descriptive, and Statistical Notices of Cities, Towns, Villages, Stations, Industries, and Objects of Interest on Its Various Lines in Pennsylvania and New Jersey. Pennsylvania Railroad Company. p. 218. Retrieved 2010-04-21.
- Yerace, Tom (2008-12-10). "Pollution around Highlands schools among worst in nation". Valley News Dispatch. Tribune-Review Publishing Company. Archived from the original on 2008-12-11. Retrieved 2009-01-30.
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