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Kittanning is a borough and the county seat of Armstrong County , Pennsylvania , USA . It is sited 44 miles (71 km) northeast of Pittsburgh along the east bank of the Allegheny River . The name means "at the great stream" in the Delaware ( Native American ) language. Early in the twentieth century , it had large iron and steel works, foundries, coal mines, glassworks, flour and lumber mills, China, pottery, brick, lime, and clay works, mirror and typewriter factories, breweries, etc. In 1900 , 3,902 people lived in Kittanning, and in 1910 , there were 4,311 inhabitants. After Kittanning merged with Wickboro, an estimated 10,000 residents lived in Kittanning in 1914 . In 1940 , 7,550 residents existed. The population was 4,787 at the 2000 census . It is the county seat of Armstrong County GR6 . It is located on the east bank of the Allegheny River , founded on the site of the 18th century Native American village of Kittanning at the western end of the Kittanning Path . The village was destroyed by a British raid in 1756 during the French and Indian War . The blast from the explosion of gunpowder stored in the chief's house was heard in Pittsburgh , 44 miles away. It was the filming location for the 2002 movie , The Mothman Prophecies starring Richard Gere and Laura Linney .