Hillsboro is a city located in Highland County Ohio. It is also the county seat of Highland County. With a 2020 population of 6,606, it is the 219th largest city in Ohio and the 4081st largest city in the United States . Hillsboro is currently growing at a rate of 0.40% annually and its population has increased by 0.02% since the most recent census, which recorded a population of 6,605 in 2010. Hillsboro reached it's highest population of in . Spanning over 5 miles, Hillsboro has a population density of 1,207 people per square mile.
The average household income in Hillsboro is $45,682 with a poverty rate of 23.76%. The median rental costs in recent years comes to $639 per month, and the median house value is $105,700. The median age in Hillsboro is 40.9 years, 36.7 years for males, and 45.1 years for females.