Johnsonville is a village in Wayne County, Illinois, United States. The population was 69 at the 2000 census.
Johnsonville is located at 38°31′16″N 88°32′12″W (38.521057, -88.536564).
According to the 2010 census, Johnsonville has a total area of 0.21 square miles (0.54 km2), all land.
As of the census of 2000, there were 69 people, 25 households, and 20 families residing in the village. The population density was 325.9 people per square mile (126.9/km2). There were 33 housing units at an average density of 155.9 per square mile (60.7/km2). The racial makeup of the village was 100.00% White.
There were 25 households out of which 40.0% had children under the age of 18 living with them, 64.0% were married couples living together, 12.0% had a female householder with no husband present, and 20.0% were non-families. 20.0% of all households were made up of individuals and 12.0% had someone living alone who was 65 years of age or older. The average household size was 2.76 and the average family size was 3.10.
In the village, the population was spread out with 27.5% under the age of 18, 8.7% from 18 to 24, 31.9% from 25 to 44, 20.3% from 45 to 64, and 11.6% who were 65 years of age or older.