I recall a conversation I had with an Anon earlier this year who knew a LOT about the Illuminati in the U.S. He stated that Alexandria, VA was the main administrative center. Racine, WI was the site of its main data center. Austin, Tx is their site for their main security hub. Outside of Denver was another important site for them too.
From another source by the name of Salvi who escaped from the Illuminati, she indicated two important sites are Pittsburgh and San Diego. She was a youth leader in San Diego before she escaped. Spoke of a lot of pedo and sacrificing going on in their groups.