Here are the smaller routes that, in 1926, did NOT get included in the new federal highway system, but were incorporated into it in the next 15 years.
- IA 25, Winterset to Adel, was a middleman between two long north-south routes in a system that skewed many of those routes in a south-southeast/north-northwest pattern. In 1926, this route was replaced by a rerouted IA 16. In 1930, the segment became part of US 169.
- IA 26, a short spur to Rock Valley, was replaced by US 18 in 1930.
- Half of IA 64 (by that time IA 117), about Collins to Colo, would be turned into US 65 in 1940.
- IA 65, Indianola to Lucas, and 66, a spur to Humeston, were brought into US 65 in 1930.
- IA 90, Perry to Fort Dodge, was also replaced by a rerouted IA 16 in 1926 and became part of US 169 in 1930 (except the redundant segment east of Perry).