I live in Port Potomac which is in 22191. It is a nice community with a indoor/outdoor pool, tennis courts, gym, etc. I really enjoy living here and I don't feel unsafe. I think like any area, there will always be some nice areas and some not so nice areas, but every person has a different definition of what that is. I would suggest to take a drive out and view different communities and see if there are any you like. These areas are definitely improving for the better. For example, they just built a new Wegman's which I think falls in the 22191 zip code and next to it they are building upscale shops. In addition, there are a lot of newer upscale communities. Even in the older neighborhoods such as Dale City, low prices have sparked a lot investors to snatch some of these properties which are being renovated--which slowly, I think is changing the face of some of these older neighborhoods.