| 1850's |
| 1852 |
- Dec. 3 - William H. Brown filed Land Donation Claim #163 for property located approximately between South 176th Street to South 186th Street, and from 6th Avenue SW to 16th Avenue SW. The a final deed was granted on Dec. 23, 1863. First settler in what became Normandy Park. He sold the property to George and Elizabeth Outlette on Oct. 9, 1875.
- Dec. 22 - King and Pierce Counties formed from Thurston County by the Oregon Territorial Legislature.
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| 1853 |
- March 2 - U.S. President Millard Fillmore signs a bill creating the Territory of Washington out of the Territory of Oregon.
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| 1855 |
- Oct. 28 - A few Native Americans attack settlers along the White River (now the Green River) between Kent and Auburn.
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| 1856 |
- The blockhouse Fort Lone Tree Point, under the command of Capt. Charles W. Riley, was established for a short time somewhere in the Three Tree Point area.
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| 1860's |
| 1860 |
- Military Road, the first road established in King County, is completed from Fort Vancouver to Seattle. It passes through Olympia, Fort Nisqually, Fort Steilacoom, and Fort Puyallup. It was surveyed through the area in 1858.
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| 1866 |
- June 7 - At 1 p.m. Chief Seattle, the leader of the Duwamish and Suquamish Tribes in whose honor Seattle was named, dies in north Kitsap County at Old Man House.
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| 1867 |
- John Moore, the first homesteader in Des Moines, arrived probably by boat sometime in the first half of the year.
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| 1869 |
- June 29 - Just before 8 p.m., the Puget Sound region had an earthquake that was felt from Astoria, Oregon to San Juan Island.
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