According to a report by U.S. Census Bureau the population of Marion County dipped in 2016. The population in 2016 was estimated to be 65,096 it was 65232 for 2015. The estimated population dropped by 136 between 2015 and 2016. Delaware and Union County had the population increase in 2016 and Morrow and Wyandot counties decreased in 2016. Marion County which is a micropolotin had 693 births and 710 deaths in 2016.