Calhoun County continued to grow during the early 1900's with the Industrial Revolution. I the cities of Albion, Marshall and Battle Creek emerged as industrial centers. Today there are many industries in the county including the Kellogg Company, Post Cereal Division of General Foods, Eaton Manufacturing and Michigan Carton Paper Company. Battle Creek is known throughout the world, and serves as headquarters for the DLSC Program in conjunction with the Department of Defense in Washington. Also, Battle Creek is home of the international W.K. Kellogg Foundation and Battle Creek Health Center which has been in operation over 100 years.
Dairy farming accounts for over one third of the county's total agricultural income today.
The principal crops raised in the county are corn, hay and wheat. Education has been important to the people of Calhoun County since the 1830's. Today, Isaac E. Crary and Rev. John D. Pierce are best remembered as founders of the Michigan educational system in 1834. Albion College is one of Michigan's oldest denomination colleges. Other well known schools in the county include the Vocational Education Center in Battle Creek and Kellogg Community College.