They're rotten in Iowa as with most places. They will take railroad tracks and water courses into cities and once they find the easy-pickings in town they don't leave.
I know it's counterintuitive, and guys are gonna pile on the hate for the following statement, but biologists and Pheasants Forever research studies have conlcuded that if you're managing a property for upland and waterfowl let the coyotes walk.
"Like Pheasants? Thank a coyote"
On the contrary, if you're managing a property for deer, kill every coyote you can. They are the number one predator for fawns. The problem is there is almost always another one to take its place as the males will travel very long distances when establishing a territory. I believe the statistic I read was that you have to eliminate 75% or more in a given area just to *maintain* the population. Real reduction takes a very concerted effort- hunting and trapping where legal. In Iowa there is a continuous open season for coyotes and they can be taken with high powers in all counties, unlike deer.
How Coyotes Killed Deer Hunting