Oakville, IA has a population of 157 and is the 25,489th largest city in the United States. The population density is 375 per sq mi which is 587% higher than the Iowa average and 314% higher than the national average. The median age in Oakville is 33 which is approximately 14% lower than the Iowa average of 38. In Oakville, 52% of the population over 15 years of age are married, 97% speak English and 3% speak Spanish. 85% of Oakville residents were born in Iowa, 15% were born out of state, 0% were born outside of the United States and 0% were foreign born.