Burt, IA has a population of 505 and is the 19,466th largest city in the United States. The population density is 1,160 per sq mi which is 2024% higher than the Iowa average and 1181% higher than the national average. The median age in Burt is 39 which is approximately 4% higher than the Iowa average of 38. In Burt, 54% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 78% of Burt residents were born in Iowa, 20% were born out of state, 1% were born outside of the United States and 1% were foreign born.