Batavia, IA has a population of 637 and is the 18,055th largest city in the United States. The population density is 1,070 per sq mi which is 1859% higher than the Iowa average and 1082% higher than the national average. The median age in Batavia is 38 which is approximately 1% lower than the Iowa average of 38. In Batavia, 59% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 90% of Batavia residents were born in Iowa, 10% were born out of state, 1% were born outside of the United States and 0% were foreign born.