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| | Other US highways in Iowa |
 | | Note: According to the Bureau of Public Roads' 1925 US Highway Plan and the Iowa State Highway Commission Service Bulletin from the fall of 1925, US 55 in Iowa was originally supposed to be an extension of US 53 from its southern terminus in La Crosse, WI, to Dubuque. |
 | | (Minnesota also signed US 55 instead of 53, according to the Postville Herald of October 14, 1926.) The January 1, 1927, map was the first map to show US 55, but the change was not mentioned in Highway Commission meeting notes or newspaper articles. |
 | | With the July 1, 2003, decommissionings of the southern IA 15 and IA 77, this is the only case where highway numbers are duplicated, as there is a much longer IA 136 in east-central Iowa. |
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