Granville, IA has a population of 362 and is the 21,427th largest city in the United States. The population density is 1,295 per sq mi which is 2270% higher than the Iowa average and 1329% higher than the national average. The median age in Granville is 42 which is approximately 10% higher than the Iowa average of 38. In Granville, 66% of the population over 15 years of age are married, 93% speak English and 7% speak Spanish. 80% of Granville residents were born in Iowa, 16% were born out of state, 0% were born outside of the United States and 5% were foreign born.