Yale is a city in St. Clair County in the U.S. state of Michigan. The population was 1,955 at the 2010 census. Yale is considered unofficially as the Bologna Capital of the world, in part due to its Yale Bologna Festival, which began in 1989. Yale bologna is sold in grocery stores throughout the area. Yale is also home to the Yale Airport which is just south of town on Brockway Rd.