This one is easy.

The places with the longest living and happiest people are rural towns.

The places with the shortest living, most stressed people are also rural towns.

Small numbers breed statistical anomalies because it’s easier for 10 people in a town of 100 to happen to have bad or great lives than it is for 10000 of 100000.

They could be different facility types.

Amazon has sort centers, distribution centers, returns processing centers, robotic fulfillment centers, non-robotic fulfillment centers, and maybe other stuff I don't know about.

The people at different warehouse types are often doing different jobs.

According to a quick search, JFK8 is fulfillment center where they do pick and pack, and it's also one of the warehouses with the Kiva robots.

Couldn't find too much about PDX9.

It's not going to be perfect and local safety culture can turn a low volume place into a nightmare if managers don't care.

Alternatively is it still a large one? They have large hubs that serve larger areas, not everything is around to be serviced by a local hub.

I honestly don't know if it is a large one. The nearest populated areas to Portland are Seattle, 200 miles to the north; Boise, 450 miles to the east; and Sacramento, 600 miles to the south. Maybe the Portland hub is used to serve all the little town halfway between Portland and Seattle, Boise and Sacramento?

It looks pretty big and is next to a Fedex Ground hub. It's pretty definitely a major distribution hub for the whole area.

https://www.google.com/maps/place/Amazon+Fulfillment+Center+...