Pennsylvania Route 523
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| PA Route 523 |
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| Length: | 8 mi[1] (13 km) | ||||||||||||
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| Formed: | 1970 | ||||||||||||
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| North end: | |||||||||||||
| Counties: | Somerset | ||||||||||||
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Pennsylvania Route 523 is an 8 mile long state highway located in Somerset county in Pennsylvania. The southern terminus is at US 40 in Addison. The northern terminus is at PA 281 in Confluence.

