Dr. Bob, Portland is becoming more and more Urban. It by no means could be compared with NYC, San Diego, L.A., Detroit, Atlanta, Miami, Orlando, Houston, Dallas, D.C., Cincinnati or the like, but it's growing in it's share of grittiness.
I believe there are distinct differences in Urban Fantasy, Contemporary Fantasy, Dark Fantasy and Paranormal Romance--though the realms they play in COULD all cross.
Looking back a few entries...I wouldn't've taken Harry Potter to be Urban Fantasy simply 'cause of the location of Hogwarts---I'm not so up on the series as some of you but I took it to be somewhere in the English countryside, or out of the big English cities. (Enlighten me if I'm wrong.)
I've long been drawn to setting things in and around long-abandoned futuristic cities, for some reason...the humans (or whoever) have departed, but some of the robots and automated stuff still works...come to think of it, there's one of my busted stories with that kind of background up on my website right now...