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 at the West Virginia state line
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 the West Virginia state line, where it continues as WV 69, 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.