Carlinville
- County:
- Macoupin County
- County Seat:
- Yes
- Area (mi²):
- 3.369
- State:
- Illinois
Carlinville is a city located in Macoupin County, Illinois. Carlinville has a 2026 population of 5,582. It is also the county seat of Macoupin County. Carlinville is currently declining at a rate of -0.64% annually and its population has decreased by -3.16% since the most recent census, which recorded a population of 5,764 in 2020.