The only thing is that people in rural areas seem to know more about what's going on with their neighbors, and watch out for them to some extent. When I lived in Minneapolis, St. Paul, Atlanta or one of the other larger cities/towns I've lived in, my neighbors wouldn't have noticed nor cared if someone they saw walk in my door belonged there or not. In small towns I've lived in, I had neighbors call to let me know if my son crossed the boundary he was supposed to say within, tell me if a car had stopped while I was gone (and give the make, model and a description of the driver), make sure the house was okay if they didn't see my car for a day or two and come check on me if they didn't see me for a couple days.
There may be more potential witnesses in a city, and more police surveillance, but there are a lot more nosy (concerned) neighbors in a small town. MOO