Zip Code Flag for 50011 - Iowa State University

Whoa!  By sheer cosmic luck the Zip Code Flag for Iowa State University at Ames has flag that matches its state flag, which looks like the flag of France.   Usually Zip Code Flags have five vertical stripes, witch each colour representing a number.  The fat blue stripe under the canton represents the number five.  Since zero and one repeat next to each other the stripes merge to form the pattern.

https://www.iastate.edu/

Zip Code Flag for 40022 - Finchville, Kentucky

Kinda' looks like the flag of Ireland right?  Nope is the Zip Code flag for 40022, which is in Kentucky.  Finchville to be exact.  In this case green represents 4, white represents 0, and orange represents 2.  Usually there are five stripes on a zip code flag.  But since zero and two repeat next to each other the flag gets an odd look.

http://www.uspspostoffices.com/ky/finchville/finchville

Zip Code Flag for 10004 - The Statue of Liberty

The Zip Code flag for 10004 is for Lower Manhattan.  Since the Statue of Liberty uses 10004, the field colours are red, white and green.  These colours are similar to Italy or Mexico, just by mere coincidence. But if you turn your head you might be thinking Bulgaria?

Link to Official State of Liberty Site
http://www.nps.gov/stli/index.htm

Zip Code Flag for 12345 - Schenectday, New York

The Zip Code Flag 12345 represents the USPS area for Schenectady, New York.  Also note that all of Pennsylvania, Delaware, and New York zip codes begin with a number one.  Consequently all cantons and support bars will be red as red represents the number one.

http://www.cityofschenectady.com/

Zip Code Flag for 42276 - Russellville Kentucky, William Forst House

The zip code for the William Forst House, which was the seat of the Confederate Government of Kentucky, is 42276.  Consequently its Zip Code Flag is green, orange, purple and blue. 

Zip Code flag for 20500 - The White House

The Zip Code Flag for the white house is composed of the colours: orange, white, blue, and navy blue.  All the colours represent numbers except for the Navy Blue canton, which is always navy blue.  In this case the flag orange means 2, white means 0, and blue means 5.  For the record the address of the White House is 1600 Pennsylvania Avenue, Washington DC, 20500.


https://www.whitehouse.gov/

Zip Code Flag for 90210

Zip Code Flags are based upon the zip code.  Basically the colours represent numbers.  The first part by the flag is the canton and support.  The coloured USPS style eagle with pink support represents the number 9.  The rest of the colours represent the other numbers of 90210.  In our case: white represent "zero"; orange represents "2", and red represents "1". 

Note that zip codes are fluid and do not always congeal with municipality needs, thus many people get their local geography in knot.  Subsequently most people get lost in the double speak of referring to place by its official geographic municipality boundaries and postal routes. 

In any case this the postal zip code flag for 90210.  Note that all of Hawaii, Alaska, California, Oregon, and Washington all start with a number 9.  Thus all cantons of these states will be pink.