La Porte City, IA has a population of 2,403 and is the 10,057th largest city in the United States. The population density is 941 per sq mi which is 1623% higher than the Iowa average and 939% higher than the national average. The median age in La Porte City is 42 which is approximately 12% higher than the Iowa average of 38. In La Porte City, 62% of the population over 15 years of age are married, 97% speak English and 1% speak Spanish. 85% of La Porte City residents were born in Iowa, 13% were born out of state, 0% were born outside of the United States and 1% were foreign born.