Iowa State Route 1 passes through Johnson County. This route enters Johnson County from Washington County in the southwestern corner. Then it heads northeast to Iowa City. From Ioowa City, IA St Rt 1 heads northeast around Coralville Lake to Linn County. IA St Rt 1 passes through the following towns in Johnson County. Iowa City
Salon IA St Rt 1 is multi-plexed in Johnson County. U.S. Rt. 6, at Iowa City.
IA St Rt 1 intersects the following highways in Johnson County. U.S. Rt. 218, at Iowa City. Iowa State Route 27, at Iowa City.
NB IA St Rt 1 at the Johnson/Washington County Line. NB IA St Rt 1 near Frytown. NB IA St Rt 1 near JCH F67. NB IA St Rt 1 near Old Man Creek. NB IA St Rt 1 near 500th. NB IA St Rt 1 near JCH F52. NB IA St Rt 1 near Iowa City. Looking north along IA St Rt 1 at U.S. Rt. 218/IA 27 at Iowa City. A junction marker on WB U.S. Rt. 6. BGS on EB I-80. A BGS on EB I-80. A BGS on WB I-80. A BGS on WB I-80.
