50 state governments
3000+ county governments
tens of thousands of municipal governments
intermediate government institutions like Indiana’s township governments.
I have been looking for such a list in the US for some time and have
come up empty. There are a lot of sources that do part of the job but
nobody seems to be doing the full list.
I don't think it can be done. Compiled, with a lot of work. You could never be sure you've got everything, unless you've got a staff of drones. Maintaining it would be a bitch.
This would be a list you'd think the Federal government would have.