How Postal Zones Work & How You Can Save By Outsourcing
What Are USPS Postal Zones?
The US Postal Service used to price mailers solely based on the weight of the packages or "mail pieces" in the early days. This proved inefficient over time with the onset of value-added services like priority shipment. With the introduction of postal zones, mail pieces are priced by weight and the distance traveled by these packages within the zones.
Postal zones, also called “shipping zones”, are a way to measure the distance a package travels from its starting point to its final destination. The USPS has a total of nine zones, of which eight are within the continent of the United States and the remaining zone for Freely Associated States.
These zones are measured from the perspective of zip codes and not actual travel miles. Also, the zones are not identified by geographical boundaries. They vary based on the shipper's zip code. For example, zone one covers areas within a 50-mile radius of the shipment's point of origin.
Here's what the USPS National Zone Charts Matrix looks like for your easy reference:
- Local
- Mail posted at the Post Office or PO for delivery within the service area of the same PO.
- Zone 1 - 50-mile radius and outside the service area of the PO.
- Zone 2 - 51 to 150-mile radius.
- Zone 3 - 151 to 300-mile radius.
- Zone 4 - 301 to 600-mile radius.
- Zone 5 - 601 to 1000-mile radius.
- Zone 6 - 1001 to 1400-mile radius.
- Zone 7 - 1400 to 1800-mile radius.
- Zone 8 - 1801 miles or more.
- Zone 9 - Freely Associated States
How Do I Know Which USPS Zone I'm In?
We talked earlier about how the zones are not fixed based on geographies but are based on the shipper's ZIP code. The first zone is within a 50-mile radius of your ZIP code, provided it's not under the service area of your local office. The zone number increases as the distance to your final destination increases.
As a shipper, you will want to know your final destination's zone to determine your shipping costs. Use the "Get Zone for ZIP Code Pair" calculator under the Domestic Zone Chart to find out which USPS Zone your final shipment destination falls under.
You will need to provide the ZIP code you're mailing from, the ZIP code you're mailing to, and the date when you plan to ship, after which you'll be given your specific Zone number.
What Are Zones 1 & 2 for USPS?
Zone one is when the final destination for your shipment is within a 50-mile radius of your zip code. If you're posting to your local PO for delivery within the service area of the PO, this would be considered local and not zone one.
Zone two is when your final destination is within a 51 to 150-mile radius of your zip code.
What Do Zones Mean for Shipping?
Knowing how USPS Postal Zones are determined can help you understand how much to allocate for shipping costs from your operational budget. You want your postal services to be efficient and reliable. But you also want it to be cost-efficient. Otherwise, you risk profitability, and your business will not be able to sustain itself long-term.
How to Save Costs by Outsourcing Order Fulfillment
Partnering with an experienced and professional nationwide order fulfillment company like ShipNetwork can help you offset many of the costs associated with order fulfillment, especially your shipping costs, and significantly improve your efficiency in the process.
ShipNetwork has 13 fulfillment centers across the United States, offering a one to two-day delivery reach for 98% of destinations in the US. By using fulfillment centers closer to your final destinations, you can reduce how much you pay for shipping charges. ShipNetwork offers a complete fulfillment, shipping, and returns solution. To learn more about how we can help you ship faster and better, schedule a call with our team or request a quote today.
FAQs
Shipping zones are geographic areas carriers use to calculate shipping distance and cost. The farther a package travels from the fulfillment center to the customer, the higher the shipping zone usually is. For enterprise ecommerce brands, shipping zones matter because they directly impact delivery speed, shipping costs, and customer satisfaction.
ShipNetwork helps growing ecommerce brands reduce the distance packages travel by supporting fulfillment strategies that place inventory closer to customers. By optimizing fulfillment locations and carrier selection, brands can lower shipping costs, improve delivery times, and create a more consistent customer experience.
As order volume grows, small shipping cost differences can become major operational expenses. Enterprise brands shipping hundreds or thousands of orders per month need to manage zones carefully to control costs, protect margins, and maintain fast delivery promises across multiple regions.
Lower shipping zones usually mean packages travel shorter distances, which can lead to faster delivery times. When inventory is positioned closer to customers, brands can often reduce transit times and improve the post-purchase experience.
Yes. Faster, more reliable delivery can improve customer satisfaction and encourage repeat purchases. For brands in categories like apparel, beauty, wellness, CPG, and lifestyle products, consistent delivery performance can directly support stronger customer retention.
ShipNetwork supports enterprise brands with scalable fulfillment solutions that help manage DTC, B2B, marketplace, retail, and wholesale orders. By combining fulfillment strategy, operational visibility, and shipping optimization, ShipNetwork helps brands control costs while maintaining speed and accuracy.
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