I don't live in Iowa City but do live in Iowa; the (visible) homelessness population is still nearly zero. I have to imagine that anyone who finds themselves homeless for long enough will eventually find a way to move indoors (couch surfing, shelters) and become less visible or, if possible, leave the state entirely for warmer climes. Winters just aren't survivable here for the "traditional" homelessness we think of when we envision camps of people in California metros.