Like a lot of other places, Iowa has seen the cost of living rise pretty drastically in recent years. For many, this has been too much. There isn't a whole lot to do in Iowa, according to those who are choosing to move out of the state. On the bright side, the state's economy is doing really well, but that's part of the reason that property prices and other things are rising.
The state's overall growth is pretty slow, but it doesn't look as though Iowa's population is going to plummet anytime soon, so long as they don't raise taxes too much.