Pennsylvania State Route 61 runs east-west across Northumberland County. It runs from the Columbia/Northumberland County Line, near Mt. Carmel, to the Northumberland/Snyder County Line, near Sunbury. PA St Rt 61 passes through the following towns in Northumberland County. Mt. Carmel Kulpmont Ranshaw Marshallton Shamokin Sunnyside Meadowview Oaklyn Sunbury PA St Rt 61 is multi-plexed in Northumberland County. Pennsylvania State Route 147, at Sunbury. PA St Rt 61 intersects the following highways in Northumberland County. Pennsylvania State Route 54, at Mt. Carmel. Pennsylvania State Route 901, at Ranshaw. Pennsylvania State Route 125, at Shamokin. Pennsylvania State Route 225, at Shamokin. Pennsylvania State Route 487, at Meadowview. Pennsylvania State Route 890, at Sunbury. TRUCK Pennsylvania State Route 61, at Sunbury. Pennsylvania State Route 405, at Sunbury.
Branches of PA St Rt 61. SB PA St Rt 61/147 at south PA St Rt 147. A junction marker on SB TK PA St Rt 61. NB PA St Rt 61 at PA St Rt 405. NB PA St Rt 61 near River Ave.
