Oregon County, Missouri

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Oregon County, Missouri
Oregon County MO Courthouse 20151021-020.jpg
Oregon County Courthouse in Alton
Location within Missouri
Location within Missouri
Map of the United States highlighting Missouri
Missouri's location within the U.S.
FoundedFebruary 14, 1845
Named forOregon Territory
Largest cityThayer
 • Total792 sq mi (2,051 km2)
 • Land790 sq mi (2,046 km2)
 • Water1.7 sq mi (4 km2), 0.2%
Population (est.)
 • (2015)10,953
 • Density14/sq mi (5/km2)
Congressional district8th
Time zoneCentral: UTC−6/−5

Oregon County is a county in the U.S. state of Missouri. It was organized in 1845 and named for the Oregon Territory. As of 2000, 10,344 people lived there. Its county seat is Alton.