They are almost all on the edge of Puget sound. Seattle, Tacoma and Everett are all major seafaring and manufacturing cities.
If you mean in Washington, then Seattle, Everett, Blaine, Bellingham...
because of trading
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The Puget Sound Lowlands region in western Washington is mostly at sea level. This area includes cities like Seattle and Tacoma and is known for its wetlands, estuaries, and coastal plains.
Kansas City and Omaha are two cities located in the interior lowlands of the United States. Both cities are situated in the Great Plains region, characterized by flat and relatively low-lying terrain.
Toronto, Montreal, Quebec, Ottawa,Windsor, and Hamilton are the major cities.
There are several large cities located in the state of Washington. Major cities include Seattle, Spokane, Tacoma, Olympia, and Everett.
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Some major cities in the Cascade Range include Seattle, Washington; Portland, Oregon; and Vancouver, British Columbia. These cities are located near the western edge of the Cascade Range and serve as important hubs for commerce, industry, and culture in the region.
Columbia Plateau in Washington State.
The industrial heartland of Canada is located in the St. Lawrence lowlands. It is centered near four important cities. These cities are Quebec City, Montreal, Ottawa, and Toronto.
Some of the famous cities in Washington state are: Olympia (the state capital), Seattle, Bellingham and Spokane.