
Hillsboro
- County:
- Jefferson County
- County Seat:
- Yes
- Area (mi²):
- 3.842
- State:
- Missouri
Hillsboro is a city located in Jefferson County, Missouri. Hillsboro has a 2025 population of 3,509. It is also the county seat of .Hillsboro is currently growing at a rate of 0.11% annually and its population has increased by 0.52% since the most recent census, which recorded a population of 3,491 in 2020.
The average household income in Hillsboro is $78,698 with a poverty rate of 14.82%. The median age in Hillsboro is 30.9 years: 30.3 years for males, and 33.3 years for females.