Buchanan County, Missouri
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The Buchanan County Courthouse in downtown St. Joseph
Location within the U.S. state of Missouri
Missouri's location within the U.S.
|Founded||December 31, 1838|
|Named for||James Buchanan|
|Largest city||St. Joseph|
|• Total||415 sq mi (1,070 km2)|
|• Land||408 sq mi (1,060 km2)|
|• Water||6.6 sq mi (17 km2) 1.6%|
| • Estimate |
|• Density||210/sq mi (83/km2)|
|Time zone||UTC−6 (Central)|
|• Summer (DST)||UTC−5 (CDT)|
Buchanan County is a county located in the U.S. state of Missouri. As of the 2010 United States Census, the population was 89,201. Its county seat is St. Joseph. It is named for James Buchanan, 15th President of the United States.