An unassuming gray building in Seattle’s Industrial District is home to a logistics hub that helps connect shippers and customers around the world in one to three days.

DHL, which specializes in international and cross-border shipments, has a 60-truck fleet and a team of nearly 80 workers at the Express Service Center dedicated to the safety, speed and accuracy of last-mile deliveries.

Supply Chain Dive toured the Seattle facility last month for a firsthand view of how fashion merchandise, electronics and more move through the warehouse and DHL’s broader network. Here’s what we learned.

How a DHL center in Seattle moves 4,000 packages daily
Trucks sit outside a DHL facility in Seattle, Washington.
Kelly Stroh/Supply Chain Dive

Ten miles by truck from the airport

Many shipments arrive at the DHL facility from Seattle-Tacoma International Airport, where the company’s freighters fly to and from Los Angeles International Airport throughout the week, according to flight tracking software FlightRadar24. The integrator also operates flights from Seattle to Cincinnati/Northern Kentucky International Airport.

Unit Load Devices, which serve as small shipping containers for planes, are unloaded from the freighters and then trucked about 10 miles north to the Seattle service center.

How a DHL center in Seattle moves 4,000 packages daily
Parcels are packed in a ULD, waiting to be placed on the conveyor belt.
Kelly Stroh/Supply Chain Dive

Into the warehouse and onto the conveyer belts

Once the trucks arrive at the facility, the ULDs are moved into the warehouse where employees unload and place the packages on a moving conveyor belt.

How a DHL center in Seattle moves 4,000 packages daily
An employee scans passing parcels as they move down the belt.
Kelly Stroh/Supply Chain Dive

All packages are scanned and tagged on the moving belt for tracking purposes, ensuring efficiency and accuracy. On average, the facility handles about 4,000 shipments per day, with certain days, like Mondays, being heavier.

How a DHL center in Seattle moves 4,000 packages daily
Employees inspect and sort packages.
Kelly Stroh/Supply Chain Dive

Seventy-eight people work at the facility, including couriers, supervisors and managers, operations agents and IT staff. This area is also where bags of mail are stored.

DHL’s fleet is ready for loading and delivery

How a DHL center in Seattle moves 4,000 packages daily
A fleet of delivery vehicles are parked within the DHL warehouse, waiting to be loaded. Can you spot the only vehicle equipped to handle the narrow, winding roads of Mercer Island?
Kelly Stroh/Supply Chain Dive

DHL’s Seattle Express Service Center, which was recently expanded, has parking on-site in the warehouse for its dozens of local delivery vehicles.

How a DHL center in Seattle moves 4,000 packages daily
Packages are loaded inside the delivery vehicles.
Kelly Stroh/Supply Chain Dive

After being scanned and tagged, the packages continue to move down the conveyor belt, and couriers place them into delivery vehicles. The facility employs 65 couriers, who are also cross-trained for other tasks, like sorting.

All packages are packed and placed into the vehicles for delivery to their final destinations.

Visuals Editor Shaun Lucas contributed to this story.