Drainage summary
Johnson County, Illinois has a recorded population of 13,320. For drainage, the page currently shows stormwater segments: ~ 136, ditches and channels: ~ 34, low points: ~ 14, road shoulders: ~ 91, residents covered: 13,320. The figures use the available U.S. geography, population, housing and local-structure data for this place.
Calculated from U.S. geography, population and local structure. Public messages are moderated before publication.