Tiffin, IA has a population of 2,530 and is the 9,776th largest city in the United States. The population density is 616 per sq mi which is 1028% higher than the Iowa average and 580% higher than the national average. The median age in Tiffin is 30 which is approximately 20% lower than the Iowa average of 38. In Tiffin, 50% of the population over 15 years of age are married, 93% speak English and 6% speak Spanish. 76% of Tiffin residents were born in Iowa, 19% were born out of state, 0% were born outside of the United States and 5% were foreign born.