The Toledo Metropolitan Area, or Greater Toledo, or Northwest Ohio is a metropolitan area centered on the American city of Toledo, Ohio. As of the 2020 census, the four-county Metropolitan Statistical Area (MSA) had a population of 646,604. It is the sixth-largest metropolitan area in the state of Ohio, behind Cincinnati–Northern Kentucky, Cleveland, Columbus, Dayton, and Akron. The wider region of Northwest Ohio adds Defiance, Henry, Paulding, Putnam, Van Wert, and Williams counties.