List of Interstate Highways in Iowa

Interstate Highways of the Iowa Primary Highway System
Interstate Highways of the Iowa Primary Highway System
	Highway markers for I-80, I-380, and I-35 Bus. Loop
	Interstate Highways in Iowa highlighted in red
System information
Formed	August 14, 1957[1]
Highway names
Interstates	Interstate X (I-X)
Business Loops:	Interstate X Business (I-X Bus.)
System links
	Iowa Primary Highway System; Interstate; US; State; Secondary; Scenic;

Interstate Highways in Iowa form a network of freeways that cross the state.

Primary Interstates


Number	Length (mi)[2]	Length (km)	Southern or western terminus	Northern or eastern terminus	Formed	Removed
I-29	151.941	244.525	I-29 at Hamburg	I-29 at Sioux City	01958-10-011958	current
I-35	218.532	351.693	I-35 near Lamoni	I-35 near Albert Lea, Minn.	01958-09-211958	current
I-74	5.399	8.689	I-80 at Davenport	I-74 / US 6 at Bettendorf	01968-08-301968	current
I-80	306.392	493.090	I-80 at Council Bluffs	I-80 at LeClaire	01958-09-211958	current


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	01966-01-011966	01973-01-011973	Replaced by I-680; now I-880
I-129	0.286	0.460	I-129 / US 20 / US 75 at Sioux City	I-29 / US 20 / US 75 at Sioux City	01976-11-221976	current
I-235	14.585	23.472	I-35 / I-80 at West Des Moines	I-35 / I-80 at Des Moines	01961-12-141961	current
I-280	9.862	15.871	I-80 / US 6 at Davenport	I-280 at Rock Island, Ill.	01973-10-251973	current
I-380	72.969	117.432	I-80 / U.S. Route 218 / Iowa 27 near Coralville	US 218 at Waterloo	01973-09-191973	current
I-480	0.877	1.411	I-480 / US 6 at Council Bluffs	I-29 / US 6 at Council Bluffs	01966-09-211966	current
I-680	3.353	5.396	I-680 at Omaha, Neb.	I-29 near Crescent	01966-12-131966	current
I-880	17.102	27.523	I-29 at Loveland	I-80 near Neola	02019-10-052019	current	Replaced a portion of I-680
Former

Auxiliary Interstates
I‑235 crossing the Des Moines River in Des Moines, Iowa
The Edna M. Griffin Memorial Bridge carrying I‑235 across the Des Moines River
The I‑480 bridge over the Missouri River between Council Bluffs, Iowa and Downtown Omaha, Nebraska
I‑280 crosses the Mississippi River over the Baker Bridge.


Number	Length (mi)[2]	Length (km)	Southern or western terminus	Northern or eastern terminus	Cities	Formed	Removed
I-35 Business Loop	6.927	11.148	I-35 / US 30 in Ames	I-35 in Ames	Ames	01995-10-271995	current
I-35 Business Loop	2.979	4.794	I-35 / US 18 in Clear Lake	I-35 / US 18 / Iowa 122 in Clear Lake	Clear Lake	01999-04-171999	current

Official Route Numbering for the National System of Interstate and Defense Highways (Map). American Association of State Highway Officials. August 14, 1957.
"Road Network (Portal)" (ESRI shapefile). Ames: Iowa Department of Transportation. April 9, 2021. Retrieved April 19, 2021.

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