Iowa State Route 27 runs north-south along Western Bremer County. This runs from the Bremer/Chickasaw County Line to the Bremer/Black Hawk County Line. It has one spur at Waverly. IA St Rt 27 passes through the following town in Bremer County. Janesville
IA St Rt 27 is multi-plexed in Bremer County. U.S. Rt. 218, through Bremer County.
SB U.S. Rt. 218/IA St Rt 27 north of Plainfield. SB U.S. Rt. 218/IA St Rt 27 south of Plainfield. SB U.S. Rt. 218/IA St Rt 27 near Waverly. SB U.S. Rt. 218/IA St Rt 27 near Janesville.