Clay County is a county in the U.S. state of Minnesota. As of the 2020 census, the population was 65,318. Its county seat is Moorhead.

Moorhead is a city in and county seat of Clay County, Minnesota, United States, on the banks of the Red River of the North. Located in the Red River Valley, an extremely fertile and active agricultural region, Moorhead is also home to several corporations and manufacturing industries. Across the river from Fargo, North Dakota, Moorhead helps form the core of the Fargo–Moorhead ND-MN Metropolitan Area. The population was 44,505 at the 2020 census.