Buchanan County, Missouri

Buchanan County
Buchanan County
County
	The Buchanan County Courthouse in downtown St. Joseph
	Location within the U.S. state of Missouri
	Missouri's location within the U.S.
	Coordinates: 39°40′N 94°49′W / 39.67°N 94.81°W
Country	United States
State	Missouri
Founded	December 31, 1838
Named for	James Buchanan
Seat	St. Joseph
Largest city	St. Joseph
Area
• Total	415 sq mi (1,070 km2)
• Land	408 sq mi (1,060 km2)
• Water	6.6 sq mi (17 km2) 1.6%
Population (2020)
• Total	84,793
• Density	200/sq mi (79/km2)
Time zone	UTC−6 (Central)
• Summer (DST)	UTC−5 (CDT)
Congressional district	6th
Website	www.co.buchanan.mo.us

Buchanan County is located in the U.S. state of Missouri. As of the 2020 United States Census, the population was 84,793.^[1] Its county seat is St. Joseph.^[2] When originally formed in 1838, the county was named Roberts County, after settler Hiram Roberts. It was renamed in 1839 for James Buchanan, then a U.S. Senator and later President of the United States. The county was formed from land annexed to Missouri, as were five other counties.

Buchanan County is included in the Kansas City CSA.

^ "2020 Population and Housing State Data". United States Census Bureau. Retrieved August 31, 2021.
^ "Find a County". National Association of Counties. Archived from the original on May 31, 2011. Retrieved June 7, 2011.