"Technically yes, but if you're talking about NY, NJ & CT ... then no, but I was born there."
Of the 62 points in the United States where three and only three states meet (each of which may be associated with its own tri-state area), 34 are on dry land and 28 are in water.
Yes, I am in the desert where AZ, CA, and MX meet. Los Algodones, MX is called "dental capital of the world". People will buy a passport, fly here, stay in a motel, cross the border to get their teeth fixed, and still get the job done for less than it would cost back home. https://losalgodones.com/
Some states share big cities and adjacent suburbs .. since they're all so close together. That would be like the New York/New Jersey and Connecticut area. More common on the East Coast.