Incumbent Democratic Attorney GeneralTom Miller has served in the position since 1995, and previously from 1979 to 1991. The Republican Party did not nominate anyone, but the Libertarian Party nominated Marco Battaglia
Incumbent Democratic State TreasurerMichael L. Fitzgerald, who has served in the position since 1983, ran for reelection to a tenth term in office. Fitzgerald was unopposed in the primary and does not have a Republican challenger, however does have a challenger from the Libertarian party.
The 25 odd-numbered Iowa Senate seats were up for election in 2018, as were all 100 Iowa House seats.
^"Candidate List - Certified June 5, 2018 Primary Election" (PDF). Retrieved May 23, 2018.
^Rucker, Philip; Denyer, Simon (December 7, 2016). "Trump picks Iowa Gov. Terry Branstad — a 'friend' of China's leader — as Beijing ambassador". The Washington Post. Retrieved December 8, 2016.
^ abBarack Obama [@BarackObama] (August 1, 2018). "Today I'm proud to endorse such a wide and impressive array of Democratic candidates – leaders as diverse, patriotic, and big-hearted as the America they're running to represent:" (Tweet). Retrieved August 1, 2018 – via Twitter.
^Petroski, William (March 7, 2016). "Iowa Treasurer Michael Fitzgerald will seek 10th term". The Des Moines Register. Retrieved July 15, 2016.
^Borg, Dean (April 22, 2016). "Iowa Secretary of Agriculture Bill Northey". Iowa Public Television. Retrieved July 15, 2016.
^Henderson, O. Kay (December 7, 2016). "Branstad calls ambassadorship 'extraordinary opportunity…new mission'". Radio Iowa. Retrieved March 22, 2017.
^Henderson, O. Kay (December 10, 2016). "Northey would be interested in lieutenant governor role". Radio Iowa. Retrieved March 22, 2017.