I found a bug --- when I click on a circle with a number, the map correctly zooms in to the area and shows the companies, but when I zoom out, I am unable to load companies outside of that area, e.g. I clicked on SLC and saw the companies there, but I see no companies outside of SLC when I zoom out.
I found this on Atlas Obscura before a trip to Barcelona, and I was able to set up a free tour with them via email. I love the contrast of the computer against the shell of the old church, and it immersed me further into my Dan Brown book character LARP.
I've had success with Psychology Today search in the Seattle area --- if a provider is full or has no openings, ask if they know anyone who is not. That has also helped me!