There's numerous movies where the plot was set within Iowa, but not necessarily filmed in the Hawkeye State. Example: The 2011 movie "Cedar Rapids" -- IS set in Cedar Rapids, but was filmed in Michigan. (below)

Other movies have been filmed on location in Iowa, but the plot doesn't involve the state, like "Twister." Portions of the 1996 movie were filmed in Iowa, but the plot takes place in Oklahoma.

Below is a list of some of the movies that were set in Iowa, but not necessarily filmed within the state.