Willows is a city in and the county seat of Glenn County, California, United States, located in the Sacramento Valley region of Northern California. The city is home to regional government offices, including the California Highway Patrol, the California Department of Motor Vehicles, the United States Bureau of Reclamation and the main offices of the Mendocino National Forest, which comprises about one million acres of Federal land located mostly in mountainous terrain west of Willows. The population was 6,293 at the 2020 census.