Spring Grove, IN has a population of 393 and is the 20,973rd largest city in the United States. The population density is 1,294 per sq mi which is 621% higher than the Indiana average and 1328% higher than the national average. The median age in Spring Grove is 50 which is approximately 34% higher than the Indiana average of 37. In Spring Grove, 70% of the population over 15 years of age are married, 98% speak English and 1% speak Spanish. 58% of Spring Grove residents were born in Indiana, 39% were born out of state, 0% were born outside of the United States and 3% were foreign born.