Every package you ship has a zone, and the zone is set by one thing you control: where the package starts. This guide shows how zones are calculated, what each zone adds to postage using FedEx's published 2026 rates, and what happens to a 10,000-order month when the warehouse moves from a coast to the middle of the country.
A shipping zone is a distance band between the origin ZIP code and the destination ZIP code, numbered 2 to 8 for ground service in the lower 48, and every step up costs more. On FedEx's 2026 list rates, a 5 lb Ground package costs $14.06 in zone 2 and $21.69 in zone 8, a 54% increase. A central warehouse caps your worst zone, but a coastal warehouse can still win if most of your customers live near it.
What is a shipping zone and how is it calculated?
A shipping zone is the distance band a carrier assigns to an origin and destination pair. For USPS, the distance is measured between the centroids of the 3-digit ZIP code areas, and the Postal Service publishes the results as zone charts that it updates quarterly (USPS FAQ, February 3, 2026). Zones are numbered Local and 1 through 9; zone 9 covers certain island destinations.
UPS and FedEx publish their own zone charts keyed to the origin ZIP code. FedEx's service guide tells shippers to enter an origin and destination ZIP code in its rate tools to find the zone, and notes that ZIP and zone alignments can change without notice. Because the origin is part of the lookup, the same customer address can be zone 2 from one warehouse and zone 8 from another.
The USPS Domestic Mail Manual defines the bands by radius from the origin:
| Zone | Distance from origin (USPS DMM 608, accessed October 2026) |
|---|---|
| 1 | Same 3-digit ZIP pair and nearby areas (about 50 miles) |
| 2 | Up to about 150 miles |
| 3 | Up to about 300 miles |
| 4 | Up to about 600 miles |
| 5 | Up to about 1,000 miles |
| 6 | Up to about 1,400 miles |
| 7 | Up to about 1,800 miles |
| 8 | Beyond about 1,800 miles |
FedEx Ground and Home Delivery rate tables start at zone 2 and run to zone 8 for the contiguous U.S., which matches this ladder.
How much does each zone add to postage?
Each zone step adds postage, and the steps get steeper as the package gets heavier. Here are FedEx Ground and Home Delivery standard list rates from the FedEx Service Guide effective January 5, 2026 (updated September 11, 2026):
| Package weight | Zone 2 | Zone 3 | Zone 4 | Zone 5 | Zone 6 | Zone 7 | Zone 8 | Zone 8 vs zone 2 |
|---|---|---|---|---|---|---|---|---|
| 1 lb | $11.99 | $12.21 | $13.26 | $14.00 | $14.47 | $14.75 | $15.01 | +25% |
| 5 lb | $14.06 | $15.62 | $17.06 | $18.53 | $19.26 | $20.47 | $21.69 | +54% |
| 10 lb | $15.85 | $17.02 | $18.56 | $20.46 | $21.10 | $23.87 | $26.38 | +66% |
These are published list rates, not what any brand pays. Contract discounts change the dollars, so use the table for the shape of the ladder: a light package pays about a quarter more to cross the country, and a 10 lb package pays about two thirds more. FedEx also adds a $6.45 residential surcharge per Home Delivery package, which is the same in every zone and so does not change the gap between zones.
FedEx lists Ground delivery commitments of 1 to 5 days based on distance to the destination, so zone also drives transit time, not just price.
Which zones do your customers land in from a coastal or a central warehouse?
A warehouse on a coast puts nearby customers in zone 2 and far ones in zone 8, while a warehouse in the middle puts almost everyone in zones 5 and 6. The table uses approximate straight-line distances between city centers to place four stand-in destinations, one per region. Carriers use 3-digit ZIP centroids, so a specific ZIP pair can land one zone either side; look up your own pairs in the carrier tools.
| Destination | From Newark, NJ (coastal) | Zone | From Dallas-Fort Worth (central) | Zone |
|---|---|---|---|---|
| New York, NY | about 10 miles | 2 | about 1,370 miles | 6 |
| Atlanta, GA | about 750 miles | 5 | about 720 miles | 5 |
| Chicago, IL | about 710 miles | 5 | about 800 miles | 5 |
| Los Angeles, CA | about 2,450 miles | 8 | about 1,240 miles | 6 |
The coastal warehouse has the best zone (2) and the worst (8). The central warehouse has neither: its range is zone 5 to 6 for these four cities, and its farthest large markets sit in zone 7 at most.
Does a central warehouse always lower postage? A worked example at 10,000 orders a month
No. A central warehouse lowers postage when your customers are spread across the country or concentrated far from the coast, and it loses when most customers sit near the coastal warehouse. The table prices three customer mixes using the FedEx zone 2 to 8 list rates above, for a 5 lb and a 10 lb package, across 10,000 orders a month.
The mixes are examples, not Orderfy data: Mix A splits orders evenly across the four cities. Mix B puts 40% in Los Angeles and 20% in each of the others, like a brand with a strong West Coast following. Mix C puts 50% in New York, 20% each in Atlanta and Chicago and 10% in Los Angeles, like a brand whose buyers are mostly in the Northeast.
| Customer mix | Package | Average postage, Newark NJ | Average postage, Dallas-Fort Worth | Monthly difference at 10,000 orders |
|---|---|---|---|---|
| A: even split | 5 lb | $18.20 | $18.90 | Newark cheaper by about $6,900 |
| A: even split | 10 lb | $20.79 | $20.78 | Even |
| B: West-heavy | 5 lb | $18.90 | $18.97 | Newark cheaper by about $700 |
| B: West-heavy | 10 lb | $21.91 | $20.84 | Dallas-Fort Worth cheaper by about $10,600 |
| C: Northeast-heavy | 5 lb | $16.61 | $18.97 | Newark cheaper by about $23,600 |
| C: Northeast-heavy | 10 lb | $18.75 | $20.84 | Newark cheaper by about $21,000 |
Three lessons come out of this. First, the central warehouse does not win on average zone for light packages, because zone 6 to New York costs more than zone 2. Second, the gap flips as packages get heavier and customers move west, because the zone 8 premium is largest on heavy packages. Third, if your customers cluster in one region, put inventory near that region or split inventory, rather than assuming the middle of the map is cheapest.
This is why we do not claim a central warehouse is always cheapest. It is a hedge: it limits your worst zone and your slowest ground transit. The question for a brand with a national customer base is whether that hedge is worth more than a cheaper best case on one coast. Our guide on Southeast 3PL vs central warehouse walks through the same trade-off for one region.
How do you work out your own zone mix?
Run the calculation on your own orders, because the example mixes are not your customers. It takes an afternoon:
- Export the last 90 days of orders from Shopify with destination ZIP code, package weight and package dimensions.
- Group destinations by the first three digits of the ZIP code, because that is how USPS builds its zone charts.
- Look up the zone for each 3-digit group from every warehouse origin you are considering, using the carrier zone charts or rate tools.
- Multiply each group's orders by the carrier rate for its zone and weight, from the rate card you would actually be on.
- Add the residential and delivery-area surcharges, which do not depend on zone, and compare the totals.
- Compare the worst-case zone too. A warehouse that puts 15% of orders in zone 8 carries more transit-time risk than one that puts 15% in zone 6.
Our 3PL cost calculator lets you enter your average label cost once you have the result, and the 3PL cost guide shows where postage sits on a full invoice.
What else changes the postage a warehouse location can save?
Zone is only one input to the label price. Weight and box size matter as much: a larger box can raise billable weight regardless of zone, so a smaller box lowers the whole row of the rate table. Services matter too, because a lighter parcel in a lower zone may qualify for a cheaper service class. Ask any 3PL to show both a zone mix and a billable-weight breakdown before you compare quotes, since a low zone with a heavy billable weight can cost more than a higher zone with a right-sized box.
Postage billing also differs between 3PLs. Some pass carrier cost through, some add a markup, and some bundle it. Ask how postage is billed and whether you can see the carrier's zone and billable weight on every label.
Where Orderfy fits
Orderfy is a tech-enabled, modern 3PL for high-volume Shopify and Amazon brands. Our warehouse is in the Dallas-Fort Worth area, in the center of the US, so ground packages reach both coasts from a single location without a coast-to-coast zone 8 hop for most of the country. Our in-house warehouse management system is included for clients, and it tracks every order at every stage and shows real-time inventory synced natively with Shopify.
Every inbound and outbound shipment is documented with photos, and clients get direct communication channels to the warehouse team around the clock. Order accuracy is 99.9%, tracked in our WMS.
Orderfy is not the right fit if most of your customers are in one region and you want inventory next to them, or if you need several US warehouses or international fulfillment. In that case, a multi-node network is the better tool, and a good 3PL will tell you so. For a head-to-head with a multi-site provider, see Orderfy vs ShipMonk.
Frequently asked questions
Within roughly 150 miles, a package is zone 2 on carrier ground services, and USPS also has a zone 1 for the same 3-digit ZIP pair and nearby areas. FedEx Ground rate tables begin at zone 2.
The ladder is similar, but each carrier publishes its own zone charts, and assignments can differ by a zone for the same ZIP pair. USPS builds its charts from 3-digit ZIP centroids. Always price a lane using the zone chart of the carrier you will use.
Usually, yes. FedEx lists Ground as 1 to 5 days based on distance to destination, so a farther zone generally means more days in transit. Service level and the carrier's network also matter.
You can split inventory across two warehouses so each ships to the nearer half of the country. That cuts average zone but adds receiving and storage cost, and splits stock, so test it with your order data first.
They affect the postage line, which is usually the largest part of the invoice per order. A 3PL's pick and pack fee does not change by zone, but the label cost does, which is why the same brand can see different postage from two warehouses.
USPS updates its zone charts quarterly, and FedEx notes that zone alignments are subject to change without notice. Re-check your lanes at least once a year and whenever you add a warehouse.
Sources
- USPS Domestic Mail Manual 608, Postal Information and Resources, section 9 Postal Zones (accessed October 2026)
- USPS FAQ: What are the Zone Charts and how can I obtain one? (February 3, 2026)
- FedEx Service Guide, standard list rates effective January 5, 2026, updated September 11, 2026 (Ground and Home Delivery rates, zones 2 to 8; residential surcharge; delivery commitment)
- Distances between cities are approximate straight-line figures and are labeled as such; zone assignments for any real ZIP pair come from the carrier's own zone chart.
Get a quote
Send us your last 90 days of orders by destination and weight, and we will show you the zone mix from Dallas-Fort Worth next to your current warehouse. Get a quote.