Berrien County is a county in the U.S. state of Michigan. It is located at the southwest corner of the state's Lower Peninsula, located on the shore of Lake Michigan and sharing a land border with Indiana. As of the 2020 Census, the population was 154,316. The county seat is St. Joseph.

St. Joseph, colloquially known as St. Joe, is a city and the county seat of Berrien County, Michigan. It was incorporated as a village in 1834 and as a city in 1891. As of the 2020 census, the city population was 7,856. It lies on the shore of Lake Michigan, at the mouth of the St. Joseph River, about 90 miles (140 km) east-northeast of Chicago. It is home of the American Society of Agricultural and Biological Engineers.