Seattle has excellent 5G and 4G LTE coverage across most of the city. T-Mobile has the most extensive 5G coverage in Seattle and the greater metro area, partly due to its Bellevue headquarters and regional investment. Verizon and AT&T both provide strong 5G in central Seattle, Capitol Hill, and the tech corridor.
Downtown Seattle, Pike Place Market, the waterfront, and Pioneer Square all have full 5G and 4G coverage. Capitol Hill and the Seattle Central area have strong 5G. South Lake Union, home to Amazon's headquarters, has excellent 5G indoor and outdoor. University District and the University of Washington campus have strong 4G and 5G. Belltown and the Seattle centre (Space Needle) area are fully covered.
Neighborhoods: Queen Anne, Fremont, Ballard, and Wallingford all have solid 4G and 5G. West Seattle, across the West Seattle Bridge, has 4G and 5G throughout the Junction neighbourhood and Alki Beach.
The main dead zones are in the Olympic Peninsula wilderness to the west, the Cascade foothills to the east, and specific tunnel sections in the downtown transit tunnel and some elevated motorway sections. The SR-99 Alaskan Way Tunnel has limited signal in the tunnel section. The light rail subway stations and tunnels have coverage.
The Puget Sound waterways, including the ferry to Bainbridge Island and the ferries to Bremerton and Kingston, have 4G and 5G near Seattle terminal and good coverage for the first portion of the crossing. Mid-Sound areas have weaker signal. Irish travellers should check their handset is unlocked and supports the local network bands.
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