Woods County is a county located in the northwestern part of the U.S. state of Oklahoma. As of the 2020 census, the population was 8,624. Its county seat is Alva. The county is named after Samuel Newitt Wood, a renowned Kansas populist.

Alva is a city in and the county seat of Woods County, Oklahoma, United States, along the Salt Fork Arkansas River. The population was 5,028 at the time of the 2020 Census, up from 4,945 at the 2010 census. Northwestern Oklahoma State University is located in Alva.