The city generally credited with opening the first burger joint is New Haven, Connecticut, home to Louis' Lunch. Louis' Lunch, founded by Danish immigrant Louis Lassen in 1895, is often recognized as the birthplace of the hamburger in the United States. It claims to be the first restaurant to serve hamburgers and remains in operation today, making it one of the oldest burger joints still serving classic burgers.
There are other claims from places like Athens, Texas, where Fletcher Davis reportedly served hamburgers in the late 1880s, and Seymour, Wisconsin, as well as some competing legends. However, Louis' Lunch in New Haven is the most widely cited and officially recognized first burger joint.