Sometimes I see a thread that asks, "Where can I find type X?" Overall I've found quite a few places where you can see a concentration of a certain type if you are looking for one in particular.
For example you can find a ton of ESTP's at any popular sports game (and a fair amount of other SP's too). You can find a concentration of INT's among university faculty (especially INTP's). If you want to find some INFP's then just go to a poetry reading, and I'll guarantee that you'll find several there. And SJ's are easy to find in any established organization like a church or corporation. I'm sure a hospital is full of both ESFJ and ISFJ employees.
Where else can you find a certain type concentrated together? Overall I'm not sure where to find a collection of any of these types:
(and to a lesser extent ENFP)