I don't know, but 250,000 can use the same address.
"The single-story brick building at 1209 North
Orange St. in downtown Wilmington, Del., looks bland and innocuous. But
the building, home to the Corporation Trust Company, has an intriguing
claim to fame. In the last few years, it has served as the registered
address for more than 250,000 businesses, giving companies around the
world access to Delaware’s business-friendly laws."
First paragraph of a piece on how the US became a tax haven.