Here's a list of the Portland neighborhoods, and a few nearby places, that are pictured on Portland Ground. (The number tells you how many images are in the local collection.)
Not that I'm counting too carefully, but I believe there are about 95 official Portland neighborhoods, and it looks like I've visited about 50 of them, plus a few neighboring places, towns and states of mind.
How do I decide where to go? I look at
one of my maps and if the question "I wonder what that looks like?" comes to my mind, I head out to have a look. It's a big beautiful world, right here in River City.