Hillsboro Oregon History
National Railway
Historical Society
Washington County History
The Provisional Legislature created Washington County as Tuality
District on July 5, 1843, as one of the four original counties
created in Oregon. Tuality County was bordered on the north by
latitude 54deg. 40min., on the east by Clackamas County, on the
west by the Pacific Ocean, and on the south by Yamhill County. In
1844, the Columbia River was made the northern boundary of Tuality
County and Clatsop County was created from Tuality County's
western half. In 1849, the Territorial Legislature changed the
name of Tuality County to Washington in honor of President George
Washington. Washington County obtained its present boundaries in
1854 with the creation of Columbia County to the north and
Multnomah County to the east. The area of Washington County is 727
square miles.
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