Greenville is a city located in Darke County Ohio. It is also the county seat of Darke County. With a 2020 population of 12,455, it is the 144th largest city in Ohio and the 2643rd largest city in the United States . Greenville is currently declining at a rate of -0.64% annually and its population has decreased by -5.84% since the most recent census, which recorded a population of 13,227 in 2010. Greenville reached it's highest population of in . Spanning over 7 miles, Greenville has a population density of 1,877 people per square mile.
The average household income in Greenville is $53,604 with a poverty rate of 16.42%. The median rental costs in recent years comes to $619 per month, and the median house value is $98,800. The median age in Greenville is 45 years, 40.2 years for males, and 49.5 years for females.