Pennsylvania Route 551
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| PA Route 551 |
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| Length: | 33 mi[1] (53 km) | ||||||||||||
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| Formed: | 1928 | ||||||||||||
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| Major junctions: |
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| North end: | |||||||||||||
| Counties: | Beaver, Lawrence, Mercer | ||||||||||||
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Pennsylvania Route 551 is an 33 mile long state highway located in Beaver, Lawrence, and Mercer counties in Pennsylvania. The southern terminus is at PA 18 in Beaver Falls. The northern terminus is at PA 18 near West Middlesex.

