|Area||7.67 sq mi (20 km2)|
|- land||7.08 sq mi (18 km2)|
|- water||0.59 sq mi (2 km2)|
|Density||973.7 / sq mi (376 / km2)|
|- summer (DST)||CDT (UTC-5)|
|Postal code||60050, 60051|
|Wikimedia Commons: Johnsburg, Illinois|
The area was settled in the 1840s by immigrants from the Eifel region of Germany, predominantly the Mayen-Koblenz district (Kreis), who named the settlement after their church. In 1956, a small subdivision on shore of the Fox River incorporated as the Village of Sunnyside. Sunnyside then annexed the surrounding land in 1992 and renamed it Johnsburg.
Johnsburg is located at (42.385796, -88.235942).
According to the 2010 census, the village has a total area of 7.67 square miles (19.9 km2), of which 7.08 square miles (18.3 km2) (or 92.31%) is land and 0.59 square miles (1.5 km2) (or 7.69%) is water. Johnsburg lies within the watershed of the Fox river.
- Richmond Road
- Ringwood Road
- McCullom Lake Road
- Johnsburg Road
- Spring Grove Road
- Chapel Hill Road
- Bay Road
- Riverside Drive
As of the census of 2000, there were 5,391 people, 1,760 households, and 1,501 families residing in the village. The population density was 973.7 people per square mile (375.7/km²). There were 1,875 housing units at an average density of 338.6 per square mile (130.7/km²). The racial makeup of the village was 98.83% White, 0.13% African American, 0.06% Native American, 0.19% Asian, 0.17% from other races, and 0.63% from two or more races. Hispanic or Latino of any race were 1.52% of the population.
There were 1,760 households out of which 44.9% had children under the age of 18 living with them, 73.9% were married couples living together, 7.1% had a female householder with no husband present, and 14.7% were non-families. 11.8% of all households were made up of individuals and 3.9% had someone living alone who was 65 years of age or older. The average household size was 3.06 and the average family size was 3.32.
In the village the population was spread out with 30.6% under the age of 18, 7.0% from 18 to 24, 28.3% from 25 to 44, 26.4% from 45 to 64, and 7.6% who were 65 years of age or older. The median age was 37 years. For every 100 females there were 102.1 males. For every 100 females age 18 and over, there were 99.4 males.
The median income for a household in the village was $69,864, and the median income for a family was $73,491. Males had a median income of $51,832 versus $30,893 for females. The per capita income for the village was $27,582. About 1.1% of families and 1.3% of the population were below the poverty line, including 2.1% of those under age 18 and none of those age 65 or over.
Four schools are part of District 12, which serves students in the village of Johnsburg. Johnsburg High School serves grades 9 through 12, and its mascot is the Skyhawk. Johnburg Junior High School or "The Wildcats" serves 5 through 8. James C. Bush Elementary School serves grades 3 and 4 and has the Bloodhounds as its mascot. Ringwood Primary Center also known as "The Ringwood Rockets" serves children from pre-school to second grade. The start of the 2008-09 school year brought the steepest enrollment in District 12 schools in five years, when 93 fewer students enrolled.
Tom Waits wrote a song called "Johnsburg, Illinois" in 1982. He included it on his album of the following year Swordfishtrombones. It is a short, poignant love poem to his wife, Kathleen Brennan, who grew up in the village.
The country music duo The Handsome Family (formerly of Chicago) referred to Johnsburg in the title track of their album In the Air, in the lyrics "Last night at the bridge to Johnsburg I swerved down a dead end street" and "Those wild dogs brought back that smell of falling snow and the girl who lives in Johnsburg across a bridge I cannot cross."
- Kathleen Brennan, American musician, songwriter, record producer, and artist.
- Clay Guida ("The Carpenter,"), mixed martial artist currently competing in the UFC, lived in Johnsburg
- Chuck Hiller, second baseman, coach, and manager with the San Francisco Giants, New York Mets, Philadelphia Phillies, Pittsburgh Pirates
- "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. 2011-02-12. Retrieved 2011-04-23.
- "2010 Census U.S. Gazetteer Files for Places – Illinois". United States Census. Retrieved 2012-10-13.
- "American FactFinder". United States Census Bureau. Retrieved 2008-01-31.
- Northwest Herald.  Accessed November 12, 2008.