Brief
History:
Yamhill District
(later county) was created on July 5,
1843, five years before the Oregon
Territory was established.
It was one of the original four
districts created by Oregon's first
Provisional Legislature, along with
Twality (later
Washington), Clackamas, and
Champooick (later Marion) counties. The
district was originally spread over 12,000
square
miles (31,000 km2), an area that was
broken up into twelve present-day
counties.
Lafayette, the principal trading
center of the western Willamette Valley in
early Oregon history, was made the county
seat
in 1847. The county government was
later (1889) moved to McMinnville where it
remains today.
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