Zone 4 is the downtown Chicago and Mag Mile scanner feed. District 1 - Central: Serving the Loop & Near South Side. District 18 - Near North: Serving the Near North Side and most of Lincoln Park.
Chicago Police Department Zone 4 dispatch handles Districts 1 and 18, covering downtown Chicago, the South Loop, River North, Navy Pier, and other areas of the Central Business District. District 1 includes the Chicago community areas of the Loop, Near South Side, and the northern part of Douglas. District 18 includes the community areas of Near North Side and most of Lincoln Park. Broadcast from a scanner a mile away from a Zone 4 transmitter.