Iowa Highway 12 is a 46.212-mile-long state highway that runs from north to south in northwestern Iowa. The highway begins in eastern Sioux City at U.S. Highway 20 and US 75. For the first seven and a
Plymouth County is the westernmost county in the U.S. state of Iowa. As of the 2020 census, the population was 25,698, and was estimated to be 25,697 in 2025. The county seat and the largest city is L
Iowa Highway 12
…I-29 / US 77 at Sioux City Iowa 3 between Westfield and Akron North end Iowa 10 in Hawarden Location Country United States State Iowa Counties Woodbury Plymouth Sioux Highway system Iowa Primary Highway System Interstate US State Secondary Scenic ← Iowa 10 → Iowa 13 Iowa Highway 12 (Iowa 12) is a 46.212-mile-long…