Alva is a city and county seat of Woods County, Oklahoma, along the Salt Fork Arkansas River. The population was 4,945 at the 2010 census. Northwestern Oklahoma State University is located in Alva. As of the census of 2000, there were 5,288 people, 2,205 households, and 1,261 families residing in the city. The population density was 2,228.6 people per square mile (861.5/km²). There were 2,644 housing units at an average density of 1,114.3 per square mile (430.7/km²). The racial makeup of the city was 94.99% White, 1.30% African American, 1.34% Native American, 0.78% Asian, 0.04% Pacific Islander, 0.23% from other races, and 1.32% from two or more races. Hispanic or Latino of any race were 1.82% of the population.