Why Seattle Has More Than One Founding Date

Seattle is generally considered founded as a modern non-Native settlement in 1851. Its lasting legal incorporation as a city came on December 2, 1869. Both answers appear because “founding” may refer to initial settlement, formal town platting, or municipal incorporation. Britannica distinguishes the 1851 settlement, 1853 town layout, and 1869 incorporation.

The short answer: 1851, with an important distinction

For the question “When was Seattle founded?”, 1851 is the conventional answer. That year marks the beginning of the permanent non-Native settlement associated with the modern city.

No single day in 1851 is an uncontested official founding date. September dates reflect early scouting and settlement activity, while November 13 marks the arrival of most of the Denny Party at Alki Point. Neither event was a legal act creating a municipality.

Seattle’s legal history began later. The first Town of Seattle plats were filed on May 23, 1853. Seattle was incorporated as a town on January 14, 1865, became unincorporated on January 28, 1867, and was reincorporated as a city on December 2, 1869. The 1869 incorporation continues today.

Before 1851: the region’s Indigenous history

The conventional founding year does not mark the beginning of human habitation in the region. Seattle stands in the traditional territory of Coast Salish peoples, particularly the Duwamish and Suquamish, whose communities had lived there for thousands of years and continue to live in the region.

When U.S. settlers arrived, the Duwamish occupied established villages around Elliott Bay and the Duwamish River. The land was therefore already a populated cultural landscape, not an uninhabited place awaiting settlement. The Seattle City Archives places the city’s settler history within this much longer Coast Salish history.

The settler townsite established in 1851 was initially associated with the names New York and New York-Alki. After most settlers moved across Elliott Bay, the village became Seattle, honoring the Duwamish leader Sealth, commonly known as Chief Seattle.

Why September 25 and November 13 both appear

The dates September 25 and November 13, 1851, describe different stages in Seattle’s settlement story.

On September 25, Denny Party scouts David Denny, John Low, and Lee Terry reached the mouth of the Duwamish River. Claims at Alki Point were selected three days later, on September 28. Most of the Denny Party then arrived aboard the schooner Exact on November 13. HistoryLink documents the scouting, claim selection, and main-party arrival as separate events.

That sequence explains the competing dates. September 25 marks the scouts’ arrival in the area, September 28 marks the selection of claims at Alki, and November 13 marks the arrival of most of the party associated with Seattle’s conventional founding story. These are related milestones rather than mutually exclusive founding dates.

The Denny Party was not the first group engaged in non-Native settlement activity in the broader area. The Collins Party arrived near the Duwamish River earlier in September, selected claims, and brought family members and household goods to those claims before the Denny Party’s main November arrival. HistoryLink’s chronology identifies the Collins Party as the area’s first non-Native settlers.

From Alki to the future downtown

The Denny Party’s initial settlement was at Alki Point in present-day West Seattle, not at the site of today’s downtown. The outpost was first called New York and then New York-Alki, incorporating a Chinook Jargon expression translated as “by and by.”

Most members of the party relocated to the eastern shore of Elliott Bay in spring 1852. That more protected location developed into the future central city near present-day Pioneer Square. The West Seattle Chamber’s historical account distinguishes the 1851 Alki settlement from the move across Elliott Bay the following spring.

The relocation adds another layer to the founding question. Alki represents the original settlement associated with the Denny Party, while the eastern Elliott Bay site became the center most closely identified with historic Seattle.

The village was later named Seattle in honor of Sealth. The name connected the new town with an Indigenous leader, even as the settlement expanded across a landscape where Duwamish communities were already established.

Seattle’s founding milestones at a glance

Date	Event	What the date signifies
September 1851	The Collins Party began settlement activity near the Duwamish River, while Denny Party scouts explored the area and selected claims at Alki.	The beginning of documented non-Native settlement activity in the broader Seattle area.
November 13, 1851	Most of the Denny Party arrived at Alki Point.	The principal arrival associated with Seattle’s conventional founding story.
Spring 1852	Most Denny Party settlers relocated to the eastern shore of Elliott Bay.	Establishment of the settlement near the future downtown and present-day Pioneer Square.
May 23, 1853	The first Town of Seattle plats were filed.	Formal platting of the town.
January 14, 1865	Seattle was incorporated as a town.	The community’s first municipal incorporation.
January 28, 1867	Seattle became unincorporated.	The first incorporation did not continue uninterrupted.
December 2, 1869	Seattle was reincorporated as a city.	The beginning of the city incorporation that continues today.

The platting date and early settlement sequence are documented in HistoryLink’s history of Seattle’s founding. Seattle Municipal Archives confirms that the first incorporation lasted from 1865 to 1867 and that the territorial legislature incorporated Seattle again on December 2, 1869.

Who is credited with founding Seattle?

The Denny Party is most commonly credited with founding modern Seattle. Its members included Arthur and David Denny, John Low, Lee Terry, William Bell, Carson Boren, and other adults and children involved in establishing the Alki settlement.

That conventional credit does not mean one person founded Seattle alone. It must also be understood alongside the Collins Party’s earlier activity near the Duwamish River and the presence of Indigenous communities that long predated both settler groups.

What was Seattle called before it was Seattle?

The settler community at Alki was initially called New York and later New York-Alki. Duwamps or Dewamps was another early name associated with settlement around the Duwamish and Elliott Bay. The community that developed on Elliott Bay ultimately adopted the name Seattle.

Who was Seattle named after?

Seattle was named in honor of Sealth, the Duwamish leader commonly known as Chief Seattle. David “Doc” Maynard is often credited with promoting the name.

The practical distinction is straightforward: 1851 is Seattle’s conventional founding year as a modern settler community, while December 2, 1869 marks its lasting incorporation as a city. Those dates are historical milestones within the much longer history of the Duwamish, Suquamish, and other Coast Salish peoples.