USPS Zone Map Lookup
USPS uses the word "zones" to describe the distance a package will travel.The zones range from Zone 1 (local) to Zone 9 (far away). A zone is determined by the "ship from" zip code related to the "ship to" zip code. The farther you're shipping, the more it costs to ship it.
To determine the cost of your USPS package, you need to know your postal zones. This zip code lookup tool can determine your receiver's address zone so that you can better estimate both your shipping costs and shipping time with USPS.