Answering the Mahalo Answers qustion: "is "58103-5754" us postal code?"Basically, yes, it is a US postal code. The extra 4 digits specify the location more accurately, usually down to a city block or building. Amazon.com uses, and is good at figuring out these codes.
The postal code you gave looks like it's for a mall http://bit.ly/d81p0V
Hope that helps
