Olivet, SD has a population of 64 and is the 27,812th largest city in the United States. The population density is 406 per sq mi which is 3656% higher than the South Dakota average and 348% higher than the national average. The median age in Olivet is 54 which is approximately 47% higher than the South Dakota average of 37. In Olivet, 49% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 34% of Olivet residents were born in South Dakota, 66% were born out of state, 0% were born outside of the United States and 0% were foreign born.