Arlington, SD has a population of 1,017 and is the 15,045th largest city in the United States. The population density is 614 per sq mi which is 5578% higher than the South Dakota average and 578% higher than the national average. The median age in Arlington is 41 which is approximately 11% higher than the South Dakota average of 37. In Arlington, 70% of the population over 15 years of age are married, 92% speak English and 8% speak Spanish. 72% of Arlington residents were born in South Dakota, 26% were born out of state, 0% were born outside of the United States and 3% were foreign born.