Hmmm. In all honesty I don't know if I can really put a number on it, but here's how I see it.

Cobra Island is the main base of operations. That's where the main Terrordrome is, Cobra Commanders temple and whatnot. It's not neccessarily a soveriegn state but it's got enough support and whatnot in the UN to keep Joe from traipsing in whenever they want. Not to mention the high level officials that secretly Cobra agents. Personnelwise I'd estimate it to be in the mid thousands, ballpark figure.

Outside of the Island it's a global network of groups in many countries around the world, certainly on all the continents. The networks break down in factions and while not all of them know they are Cobra agents, the Commander certainly has them in his grasp. All working, whether aware of it or not, toward the same goal. These would all ranged from 50-100+ depending on how big the branch is. For ex. Springfield would be much bigger as it's an entire town rather just a few scattered warehouses in say London.

I'm going to give it some more thought, but I think that's a good start.

__________________