Mount Olive is a city in Macoupin County, Illinois, United States. The population was 2,099 at the 2010 census and is part of the metro east in the St. Louis metropolitan area
Mount Olive is located at 39°4′18″N 89°43′36″W (39.071624, -89.726719).
According to the 2010 census, Mount Olive has a total area of 1.153 square miles (2.99 km2), of which 1.15 square miles (2.98 km2) (or 99.74%) is land and 0.003 square miles (0.01 km2) (or 0.26%) is water.
As of the census of 2000, there were 2,150 people, 906 households, and 609 families residing in the city. The population density was 1,948.2 people per square mile (754.7/km2). There were 991 housing units at an average density of 898.0 per square mile (347.8/km2). The racial makeup of the city was 96.79% White, 0.83% Native American, 0.64% Asian, 1.28% from other races, and 0.47% from two or more races. Hispanic or Latino of any race were 3% of the population.
There were 906 households, out of which 30.7% had children under the age of 18 living with them, 54.6% were married couples living together, 8.9% had a female householder with no husband present, and 32.7% were non-families. 29.6% of all households were made up of individuals, and 19.3% had someone living alone who was 65 years of age or older. The average household size was 2.37 and the average family size was 2.92.