Iowa Highway 12

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Iowa Highway 12 marker

Iowa Highway 12
Route information
Maintained by Iowa DOT
Length: 46.212 mi[1] (74.371 km)
Existed: 1920 – present
Loess Hills Scenic Byway
Major junctions
South end: US 20 / US 75 at Sioux City
North end: Iowa 10 in Hawarden
Highway system
Iowa 10 Iowa 13

Iowa Highway 12 (Iowa 12) is a 46.212-mile-long (74.371 km) state highway that runs from north to south in northwestern Iowa. The highway begins in eastern Sioux City at U.S. Highway 20 (US 20) and US 75. For the first seven and a half miles (12.1 km) of the route, Iowa 12 is an unsigned highway. The first five miles (8.0 km) are signed only as U.S. Highway 20 Business; the other two and a half miles (4.0 km) are overlapped by Interstate 29 (I-29). From here, the highway lies just east of the Big Sioux River, which separates Iowa from South Dakota. The northern end of Iowa 12 is in Hawarden at an intersection with Iowa 10.

Route description[edit]

Iowa Highway 12 begins at U.S. 20 and U.S. 75 signed as Business US 20. It continues west through Sioux City and becomes concurrent with Interstate 29 going west to Riverside Boulevard, where signage begins. It follows Riverside Boulevard while it passes through the Riverside neighborhood in Sioux City. It passes past Stone State Park in northwestern Sioux City and continues northwest towards Westfield. It turns northeast to enter Westfield, then intersects Iowa Highway 3. Iowa 12 and Iowa 3 overlap and go northeast to Akron, where Iowa 3 turns east. Iowa 12 continues northeast through Chatsworth and ends at Iowa 10 in Hawarden.


Iowa Highway 12 was designated as a state highway in 1920. It originally went between Hamburg and Akron. It was shortened to Missouri Valley in 1924, and Sioux City in 1926. In 1931, it was extended north to Hawarden. In 1958, it was shortened to its intersection with I-29, but then in 1979, was extended east along I-29 and the newly formed Business Route 20 to end at the new U.S. 20 bypass in eastern Sioux City. In 2000, signage for this extension was removed and signage for Iowa 12 ended at I-29, though officially, Iowa 12 continues east through Sioux City.

Major intersections[edit]

County Location mi km Exit Destinations Notes
Woodbury ConcordWoodbury
township line
0.000 0.000
US 20 / US 75 / US 20 Business begins – South Sioux City, Neb., Le Mars, Fort Dodge
Southern end of US 20 Business overlap
Sioux City 3.269 5.261
US 75 Business (Lewis Boulevard)
4.723 7.601 148
I-29 south (Loess Hills Scenic Byway) / US 77 south / US 20 Business / Wesley Parkway – South Sioux City, Neb.
No southbound exit; northern end of US 20 Business overlap; southern end of I-29 overlap
5.311 8.547 149 To US 77 south (Wesley Parkway / US 20 Business west) / Hamilton Boulevard – South Sioux City, Nebr. Northbound exit signed as Hamilton Boulevard only
7.527 12.114 151 I-29 north – Sioux Falls Northern end of I-29 overlap; signed southern end of Iowa 12
Plymouth Westfield Township 28.359 45.639 Iowa 3 west – Vermillion, S.D. Southern end of Iowa 3 overlap
Akron 33.094 53.260 Iowa 3 east (South Street) / Loess Hills Scenic Byway ends – Le Mars Northern end of Iowa 3 overlap
33.861 54.494 To SD 48 via Big Sioux River Road – Alcester, S.D.
Sioux Hawarden 46.212 74.371 Iowa 10 north (Avenue E) / Iowa 10 south (10th Street) – Alcester, S.D., Beresford, S.D., Orange City
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


Route map: Google

KML is from Wikidata