Bradley, SD has a population of 80 and is the 27,413th largest city in the United States. The population density is 326 per sq mi which is 2919% higher than the South Dakota average and 260% higher than the national average. The median age in Bradley is 51 which is approximately 39% higher than the South Dakota average of 37. In Bradley, 73% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 85% of Bradley residents were born in South Dakota, 15% were born out of state, 0% were born outside of the United States and 0% were foreign born.