Thank you, Uncle Kraig! :-D
Oops, though, I made the same mistake, so better add Onawa, and correct Atlanta spelling to Atlantic, edited below.

Hey, wait a moment, please! This newbie just got through a long time of puzzling over previous routes and the state map. Is this a race where only the faster people matter, or more of a fun ride for everyone, hmm?

Seems like this might be an interesting route:

Onawa,
Missouri Valley,
Atlantic,
Winterset,
Knoxville,
Ottumwa,
Mount Pleasant, and
Burlington.