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Number Length (mi) [2] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes I-80N: 17.102: 27.523 I-29 at Loveland: I-80 near Neola: 1966
Now local roads and County Road B35 Iowa 107: 27.579: 44.384 Iowa 3 near Alexander: CR B35 near Clear Lake: 1920: 2011 All but parts in Meservey and Thornton removed in 2003; now County Roads S25, B65 and S14 Iowa 108: 1.18: 1.90 Delta: Iowa 92 near Delta 1923: 1980 Spur route; now County Road V33 and Iowa 21 Iowa 109
The Iowa Department of Transportation is responsible for the day-to-day maintenance of the primary highway system, which consists of Interstate Highways, United States Highways, and Iowa state highways. Currently, the longest primary highway is U.S. Highway 30 at 332 miles (534 km). The shortest highway is Interstate 129 at 0.27 miles (430 m).
United States Numbered Highways of the Iowa Primary Highway System Highway markers from different years for former US 32 (1926), US 75 (1961) and current US 151 (1971) U.S. Highways in Iowa highlighted in red
Interstate 80 (I-80) is a transcontinental Interstate Highway in the United States, stretching from San Francisco, California, to Teaneck, New Jersey. In Iowa, the highway travels west to east through the center of the state.
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Interstate 29 in Iowa; Interstate 129; Interstate 35 in Iowa; Interstate 35 Business (Ames, Iowa) Interstate 35 Business (Clear Lake, Iowa) Interstate 235 (Iowa) Interstate 335 (Iowa) Interstate 74 in Iowa; Interstate 80 in Iowa; Interstate 280 (Iowa–Illinois) Interstate 380 (Iowa) Interstate 480 (Nebraska–Iowa) Interstate 680 (Nebraska–Iowa)
U.S. Highway 20 (US 20) in Iowa is a major east–west artery which runs across the state, separating the northern third of Iowa from the southern two-thirds. It enters Iowa from Nebraska, concurrent with Interstate 129 (I-129) and US 75, crossing the Missouri River at Sioux City.