I workout with Police officers, Lawyers, Doctors, Dentists, Stay at home moms, Accountants, Students, other tech folks, etc, you name it they're all there.
There's something about "shared misery" that brings people together and builds a comrade. That turns into a community where you start to hang out with them out of the gym/etc.
This happens at any group fitness place where the same people show up at the same time to do the same thing. It's natural, organic and freeing.
I've moved across the country 3 times now and this is how I integrated into each area I moved into.