Iowa State Route 1 runs north-south in the southeastern portion of Linn County. IA St Rt 1 passes through the following town in Linn County. Mt. Vernon
IA St Rt 1 is not multi-plexed in Linn County. IA St Rt 1 intersects the following highway in Linn County. U.S. Rt. 30, at Mt. Vernon.
SB IA St Rt 1 at the Jones/Linn County Line. A junction marker on EB U.S. Rt. 30.
