Pennsylvania Route 478
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| PA Route 478 |
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| Length: | 2 mi[1] (3 km) | ||||||||||||
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| Formed: | 1961 | ||||||||||||
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| Major junctions: |
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| North end: | |||||||||||||
| Counties: | Clarion, Venango | ||||||||||||
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Pennsylvania Route 478 is an 2 mile long state highway located in Clarion and Venango counties in Pennsylvania. The southern terminus is at PA 58 in St. Petersburg. The northern terminus is at PA 38/PA 208 naer Emlenton.

