Caseville is a city in Huron County in the U.S. state of Michigan, based at the mouth of the Pigeon River on Saginaw Bay and Lake Huron. The population was 777 at the 2010 census. The city is surrounded by Caseville Township. A popular destination for summer tourists, it sponsors the 10-day Cheeseburger in Caseville festival, a tribute to Jimmy Buffett's song "Cheeseburger in Paradise".