Johannisburg township
- County:
- Washington County
- County Seat:
- No
- Area (mi²):
- 36.047
- State:
- Illinois
Johannisburg township is located in Washington County, Illinois. Johannisburg township has a 2026 population of 504. Johannisburg township is currently growing at a rate of 0.4% annually but its population has decreased by -0.79% since the most recent census, which recorded a population of 508 in 2020.
The median household income in Johannisburg township is $91,964 with a poverty rate of 0%. The median age in Johannisburg township is 45.8 years: 45.7 years for males, and 58.1 years for females. For every 100 females there are 112.5 males.