Pennsylvania Route 18

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Pennsylvania Route 18
Route of PA 18 highlighted in red
Route information
Maintained by PennDOT
Length	205 mi[1] (330 km)
Tourist routes	Crawford Lakelands Scenic Byway
Major junctions
South end	WV 69 near Garrison
Major intersections	US 40 in Washington I-70 near Washington US 22 near Frankfort Springs US 30 near Harshaville I-376 near Monaca I-76 / Penna Turnpike in Big Beaver I-376 near West Middlesex I-80 / I-376 / PA 760 near West Middlesex I-90 near Platea US 20 near Girard
North end	PA 5 in Lake City
Location
Country	United States
State	Pennsylvania
Counties	Greene, Washington, Beaver, Lawrence, Mercer, Crawford, Erie
Highway system
Pennsylvania State Route System Interstate US State Scenic Legislative
← PA 17 → US 19

Pennsylvania Route 18 (PA 18) is a major north–south highway in Western Pennsylvania whose southern terminus is at West Virginia Route 69 (WV 69) at the state line in Greene County near the village of Garrison, while the northern terminus is at PA 5 in Lake City. At a length of 205 miles (330 km), PA 18 is the only state route in Pennsylvania — north–south or east–west — to traverse the entire state. It also has the distinction of being the longest state route in Pennsylvania.