The United States Postal Service (USPS) uses a system of zones to determine the distance a package needs to be shipped and the corresponding shipping rate. The USPS divides the country into 10 zones, with Zone 1 being the closest to the origin of the package and Zone 10 being the farthest.
To determine the zone for a particular location, you will need to know the zip code of the origin and destination of the package. You can then use the USPS Postal Calculator or a shipping zone map to determine the zone for each location.
Keep in mind that the zone number is only one factor that determines the shipping rate for a package. Other factors, such as the weight of the package, the dimensions of the package, and the shipping service you choose, can also affect the cost of shipping. You can use the USPS Postal Calculator or contact your local post office for more information and to get a more accurate estimate of the shipping cost for your package.