How many 5 star restaurants are there in the US?

As of my last knowledge update in October 2021, the number of 5-star restaurants in the U.S. can vary depending on the rating system used. The Michelin Guide, a prominent authority, awarded 5 stars to a very limited number of restaurants, typically only a few dozen across major cities. Other rating systems, like the AAA Five Diamond Award, also recognize a select few establishments. For the most current data, it's best to check the latest guides or reviews.