One of the major factors that will continuously impact the shipping rate is the distance for the shipping. You need to know that shipping companies have categorized the states into 8 shipping zones. The origin of the shipment is the factor that determines these. Generally, the further your package is going, the more you have to pay for it. Fortunately, the cost doesn’t get much higher in the zone. A delivery from Zone two to delivery to Zone 8 comparatively could cost an average of 10% more when you use USPS priority mail.