I seemed to have missed the news

I was recently driving behind a truck that listed the states where the company that owned the truck did business. A common enough practice, I'll grant you. Now this particular list included CT, NY, NJ, PA, MD, and VA - all well and good. It also included DC, which while not a state is a state-like entity. But then the list also included the Hamptons. Excuse me. The last time I checked, the Hamptons were part of New York. Did they break off from New York and form their own state without telling anyone? It just seemed an odd editorial choice as I was sitting behind the truck in traffic.