
Olive Branch
- County:
- Alexander County
- County Seat:
- No
- Area (mi²):
- 9.447
- State:
- Illinois
Olive Branch is a CDP located in Alexander County, Illinois. Olive Branch has a 2025 population of 506. Olive Branch is currently declining at a rate of -4.53% annually and its population has decreased by -17.05% since the most recent census, which recorded a population of 610 in 2020.
The average household income in Olive Branch is $42,728 with a poverty rate of 45.12%. The median age in Olive Branch is 56.4 years: 60.5 years for males, and 49.1 years for females.