Iowa State Route 1 runs north-south in Central Jefferson County. It runs from the Jefferson/Van Buren County Line, near Birmingham, to the Jefferson/Keokuk County Line, near Packwood. IA St Rt 1 passes through the following town in Jefferson County. Fairfield
IA St Rt 1 is multi-plexed in Jefferson County. BUSN U.S. Rt. 34, at Fairfield. IA St Rt 1 intersects the following highways in Jefferson County. U.S. Rt. 34, at Fairfield. Iowa State Route 163, at Fairfield.
NB IA St Rt 1 at the Jefferson/Van Buren County Line. NB IA St Rt 1 near Cedar Creek. NB IA St Rt 1 south of Fairfield. NB IA St Rt 1 at U.S. Rt. 34/IA St Rt 163. NB IA St Rt 1 north of U.S. Rt. 34/IA St Rt 163. NB IA St Rt 1 near Madison Ave. in Fairfield. NB IA St Rt 1 south of Burlington Ave. in Fairfield. EB BUSN U.S. Rt. 34/SB IA St Rt 1 at Main St. in Fairfield. A junction marker on EB BUSN U.S. Rt. 34. SB IA St Rt 1 at Burlington Ave. in Fairfield. NB IA St Rt 1 near Grimes Ave. in Fairfield. NB IA St Rt 1 at Kirkwood Ave. in Fairfield. NB IA St Rt 1 near 4th Street in Fiarfield. NB IA St Rt 1 north of Fairfield. NB IA St Rt 1 south of JCH H17. SB IA St Rt 1 at the Jefferson/Keokuk County Line.
