Greencastle is a city located in Putnam County Indiana. Greencastle has a 2020 population of 13,071. It is also the county seat of Putnam County. Greencastle is currently declining at a rate of -0.08% annually and its population has decreased by -0.35% since the most recent census, which recorded a population of 13,117 in 2010. Greencastle reached it's highest population of 13,117 in 2010.
The average household income in Greencastle is $65,214 with a poverty rate of 10.30%. The median rental costs in recent years comes to $757 per month, and the median house value is $121,000. The median age in Greencastle is 31.4 years, 29.6 years for males, and 33.8 years for females.