Monroe was once the site of the Great Northern Railway's botanical gardens where fresh flowers for their passenger trains were once grown. Each day these flowers would be loaded aboard the Western Star for distribution throughout the system so that each dining car passenger might have fresh flowers with their meal.
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Index -- Thumbnail History HistoryLink.org Essay 9143 :

The area now called Ballard was settled by the Duwamish Tribe after the last glacial period. There were plentiful salmon and clams in the region. The U.S. government code in the CDC  for this group is American Indian, Puget Sound Salish . The Burke Museum has artifacts from the group of Duwamish who lived at Shilshole. The references say that before non-Natives arrived, the group living around Shilshole may have been in decline due to a "great catastrophe".

Seattle's location, harbor, and commercial development made it a logical place for the Great Northern's terminus, and Hill had the good sense to engage the persuasive and influential Thomas Burke as his local agent. Having previously achieved the creation of Railroad Avenue, Burke had little difficulty persuading the city council -- over the vociferous objections of the Northern Pacific -- to give the Great Northern a 60-foot right-of-way down the middle of the wood-planked roadway.

At the foot of Columbia Street

The site of Olympia has been home to Lushootseed-speaking peoples for thousands of years, including Squaxin, Nisqually, Puyallup, Chehalis, Suquamish, and Duwamish. The first recorded visit by Europeans was in 1792 when Peter Puget and a crew from the British Vancouver Expedition charted the site. In 1846, Edmund Sylvester and Levi Smith jointly claimed the land that now comprises downtown Olympia. In 1851, the U.S. Congress established the Customs District of Puget Sound for Washington Territory and Olympia became the home of the customs house.