<p>Where it askes for my high schools "zip code +4 or postal code"does that mean if I don't know the postal code I put a 4 after the zip code? And if so, do I put, for ex: (the zip code is 13441) 13441-4 or 134414</p>
<p>Thanks!</p>
<p>Your full zipcode is 9 digits, with the 5 digit code (13441) used the most. The other 4 digits narrow down where you are more precisely, which I think helps the post office in delivering mail.</p>
<p>From <a href="http://en.wikipedia.org/wiki/Zip_code%5B/url%5D">http://en.wikipedia.org/wiki/Zip_code</a></p>
<p>"ZIP+4
In 1983, the Postal Service began using an expanded ZIP Code system called "ZIP+4", which are often called "plus-four codes". A ZIP+4 code uses of the basic 5-digit ZIP plus an additional 4-digits to identify a geographic segment within the 5-digit delivery area, such as a city block or a group of apartments or an individual high-volume receiver of mail, or any other unit that could use an extra identifier to aid in efficient mail sorting and delivery. Use of the plus-four code is not required, but it helps the Postal Service direct mail more efficiently and accurately because it reduces handling and significantly decreases the potential for human error and possibility of misdelivery."</p>
<p>awesome, thanks :-)</p>
<p>you can look the 4 digit code up online</p>