I guess Chicago is what your talking about. Never really think about Chicago, but you are totally wrong re maryland. The entire USA federal government is located in Maryland, DC and VA. In Maryland alone you have Andrews AFB, Fort Mead (home of NSA), the Naval Academy...
No, you're right. I was really just kidding about Maryland. You're right, there is some important stuff there, just not that many people or much industry. Just saying that Chicago has nearly 3 million souls in the city limits alone, and the Chicago suburbs are HUGE.