Iowa Highway 10 (Iowa 10) is a state highway that runs 104+1⁄2 miles (168.2 km) across the state of Iowa. It begins where South Dakota Highway 46 crosses the Big Sioux River into Iowa north of Hawarden. It ends east of Havelock at an intersection with Iowa Highway 4.

Quick Facts Route information, Length ...

Iowa Highway 10
Iowa 10 highlighted in red
Route information
Maintained by Iowa DOT
Length	104.512 mi[1] (168.196 km)
Major junctions
West end	SD 46 near Hawarden
Major intersections	US 75 near Maurice Iowa 60 at Alton US 59 near Sutherland US 71 near Sioux Rapids
East end	Iowa 4 in Havelock
Location
Country	United States
State	Iowa
Counties	Sioux O'Brien Clay Buena Vista Pocahontas
Highway system
Iowa Primary Highway System Interstate US State Secondary Scenic
← Iowa 9 → Iowa 11

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Iowa Highway 10 begins by going south towards Hawarden. At Hawarden, it intersects Iowa Highway 12, then turns east. Before entering Orange City, Iowa 10 intersects U.S. Highway 75. After Orange City, it enters Alton, meeting Iowa Highway 60. It continues east through Granville and meets Iowa Highway 143 before entering Paullina. After Paullina, Iowa 10 then runs concurrent for 5 miles (8.0 km) with U.S. Highway 59. They separate and Iowa 10 then enters Sutherland. Iowa 10 turns slightly southeast to go through Peterson, then continues east until intersecting U.S. Highway 71. Iowa 10 then goes south with U.S. 71, passing through Sioux Rapids before turning east again. Iowa 10 then passes through Marathon, Laurens and Havelock before ending at Iowa Highway 4 shortly after Havelock.

Iowa Highway 10 was designated as a state highway in 1920. It crossed Iowa from west to east, going from Hawarden to McGregor. It was shortened to Strawberry Point in 1926, then extended to Luxemburg in 1930 and Dubuque in 1939. In 1945, the highway was shortened to Pocahontas and in 1969, was shortened to its current eastern terminus.

In Alton, Iowa 450 is a 0.27-mile-long (430 m) route which provides a direct connection between Iowa 10 and Iowa 60. It was designated when Iowa 60 moved onto a four-lane bypass of Alton. Prior to the construction of the bypass, the two routes which Iowa 450 connect intersected in Alton.