Here, then, the complete review:
Are there one or more play areas? yes, there's one!
Is there one in every terminal, after passport control? it's in concourse C, but the whole airport is small enough that it's not far from any gate.
Is the play area conveniently located? how could it not be...
Is there information about the play areas available online? yes, the play area is marked on this map:
Are maps clearly labeled to make finding the play areas easy? yes
Are there one or more nursing areas? I don't think so; I didn't see one. Oregonians are maybe not as shy about nursing in public as the rest of the country!
Here's a quote from another website (Kids Airport Diversion Guide), I did not read this before going to Portland, so can't say if it's all accurate or not:
Portland International Airport (PDX): The people who run Portland International Airport seem to do almost everything well, not the least of which is catering to families with children. There are lots of opportunities for kids to work off steam before being strapped in for a long flight. Pre-security near the checkpoint for Concourses D and E, you’ll find a multi-colored jungle gym, replete with padded surfaces. It’s got a pair of stairs that lead to a couple of slides and a “lookout” with a toy telescope and steering wheel so kids can spy aircraft out on PDX’s tarmac. Post-security on the C Concourse there’s a play area with a bunch of attractions: Lego tables, bead maze, play cars, and a TV monitor that’s set for children-friendly channels. Best of all, the area is close to restrooms and has plenty of seats for parents.
Need something more stimulating than mere play? Take them to the ABC lobby post- security. You’ll find a stunning Columbia River exhibit with interactive monitors and native artifacts, maps, photos, and excerpts form the journals of Lewis and Clark. When you’re flying east from PDX, get a window seat for your child and see if they can spot the areas they saw on the map. That’s the essence of interactivity. Stop by Creative Kidstuff on Concourse C to get your kids come travel-worthy games to keep them occupied during the long flight.