Lowell, IN has a population of 9,423 and is the 4,121st largest city in the United States. The population density is 1,552 per sq mi which is 765% higher than the Indiana average and 1613% higher than the national average. The median age in Lowell is 35 which is approximately 6% lower than the Indiana average of 37. In Lowell, 59% of the population over 15 years of age are married, 97% speak English and 1% speak Spanish. 66% of Lowell residents were born in Indiana, 32% were born out of state, 1% were born outside of the United States and 1% were foreign born.