Wagner, SD has a population of 1,482 and is the 12,763rd largest city in the United States. The population density is 784 per sq mi which is 7153% higher than the South Dakota average and 765% higher than the national average. The median age in Wagner is 42 which is approximately 15% higher than the South Dakota average of 37. In Wagner, 53% of the population over 15 years of age are married, 95% speak English and 1% speak Spanish. 78% of Wagner residents were born in South Dakota, 20% were born out of state, 1% were born outside of the United States and 1% were foreign born.