Grinnell Mutual Reinsurance is an insurance company that provides property and casualty insurance products to customers in the United States. The company was founded in 1909 and is headquartered in Grinnell, Iowa. Grinnell Mutual Reinsurance offers a range of insurance products, including farm, home, auto, and business insurance. The company has over 1,700 employees and operates in 19 states across the United States.