SteamPunk Magazine might provide an answer. Wikipedia has an entry. My read of the subculture is that it is a form of Rust Belt Chic. The era celebrated is the pinnacle of prowess for many Rust Belt cities.
However, I have no idea if shrinking cities such as Pittsburgh serve as centers of steampunk. Reading Krugman, I think it may be case. Is there a steampunk community in Cohoes?