U.S. Federal Route 6 runs east-west across Southern Polk County. This is one of the main surface streets through Metro-Des Monies. From Des Monies east it runs along Interstate 80 to the Polk/Jasper County Line. U.S. Rt. 6 passes through the following towns in Polk County. Altoona Des Monies
WB I-80/U.S. Rt. 6 at the Jasper/Polk County Line. A BGS on WB I-80/U.S. Rt. 6. Overhead signs on WB I-80/U.S. Rt. 6. WB U.S. Rt. 6 near I-235 in Des Monies. A BGS on SB I-235. A BGS on SB I-235.