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.
Prospect Heights, IL. Prospect Heights is located in northeast Illinois. Prospect Heights is part of Cook County. Prospect Heights has 4.24 square miles of land area and 0.03 square miles of water area. As of 2010-2014, the total Prospect Heights population is 16,344, which has shrunk 4.31% since 2000.