They all have 4 weeks, but February is the only one to have exactly 4 weeks (except in Leap years when it has 4 weeks and 1 day). April, June September and November each have 30 days = 4 weeks and 2 days. The rest of the months each have 31 days = 4 weeks and 3 days.
Prospect Heights, IL Other Information. 1  Located in COOK County, Illinois. 2  Prospect Heights, IL is also known as: 3  PROSPECT HTS, IL.
Key Zip or Address or click on the map. This page shows a Google Map with an overlay of Zip Codes for Mount Prospect, Cook County, Illinois. Users can easily view the boundaries of each Zip Code. Mount Prospect, Cook County, Illinois Zip Code Map Boundary Version 3.0 Copyright Â© 1996-2017 USNaviguide LLC. All rights reserved.