Roads of the Mid-South & West > Highways of the Commonwealth of Pennsylvania > Pennsylvania State Route 642 > Pennsylvania State Route 642, Northumberland County

Pennsylvania State Route 642 Northumberland County

Pennsylvania State Route 642 is an east-west highway across Northern Northumberland County. It runs from the Montour/Northumberland County Line, near Potts Grove, to the Union/Northumberland County Line, at West Milton.

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PA St Rt 642 passes through the following towns in Northumberland County.
Potts Grove
Milton

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PA St Rt 642 is not multi-plexed in Northumberland County.

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PA St Rt 642 intersects the following highways in Northumberland County.
Pennsylvania State Route 147, at Milton.
Pennsylvania State Route 405, at Milton.

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A BGS on NB PA St Rt 147.

A junction marker on SB PA St Rt 405.

A guide marker on SB PA St Rt 405.

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8 September 2025