Mt. Olive Township (N½ T7N R6W) is located in Macoupin County, Illinois, United States. As of the 2010 census, its population was 3,274 and it contained 1,536 housing units.

Geography

According to the 2010 census, the township has a total area of 18.27 square miles (47.3 km), of which 18.02 square miles (46.7 km) (or 98.63%) is land and 0.26 square miles (0.67 km) (or 1.42%) is water.

Demographics

Historical population

Census	Pop.	Note	%±
2016 (est.)	3,135
U.S. Decennial Census

Adjacent townships

• Cahokia Township (north)
• South Litchfield Township, Montgomery County (northeast)
• Walshville Township, Montgomery County (east)
• Staunton Township (south)
• Dorchester Township (west)
• Gillespie Township (northwest)