Princeton, IA has a population of 1,100 and is the 14,553rd largest city in the United States. The population density is 427 per sq mi which is 681% higher than the Iowa average and 371% higher than the national average. The median age in Princeton is 41 which is approximately 7% higher than the Iowa average of 38. In Princeton, 59% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 72% of Princeton residents were born in Iowa, 28% were born out of state, 0% were born outside of the United States and 0% were foreign born.