Atchison County, Missouri

Atchison County
Atchison County
County
	Atchison County Memorial Building
	Location within the U.S. state of Missouri
	Missouri's location within the U.S.
	Coordinates: 40°26′N 95°26′W / 40.43°N 95.43°W
Country	United States
State	Missouri
Founded	February 14, 1845
Named for	David Rice Atchison
Seat	Rock Port
Largest city	Tarkio
Area
• Total	550 sq mi (1,400 km2)
• Land	547 sq mi (1,420 km2)
• Water	2.8 sq mi (7 km2) 0.5%
Population (2020)
• Total	5,305
• Density	9.6/sq mi (3.7/km2)
Time zone	UTC−6 (Central)
• Summer (DST)	UTC−5 (CDT)
Congressional district	6th
Website	www.atchisoncounty.org

Atchison County is the northwesternmost county in the U.S. state of Missouri. As of the 2020 census, the county had a population of 5,305.^[1] Its county seat is Rock Port.^[2] It was originally known as Allen County when it was detached from Holt County in 1843.^[3] The county was officially organized on February 14, 1845, and named for U.S. Senator David Rice Atchison from Missouri.^[4]

^ "2020 Population and Housing State Data". United States Census Bureau. Retrieved August 25, 2021.
^ "Find a County". National Association of Counties. Archived from the original on May 31, 2011. Retrieved June 7, 2011.
^ "Disappearing Missouri Names". The Kansas City Star. March 19, 1911. p. 15. Retrieved August 15, 2014 – via Newspapers.com.
^ Eaton, David Wolfe (1916). How Missouri Counties, Towns and Streams Were Named. The State Historical Society of Missouri. pp. 202.

[QF-1] "2020 Population and Housing State Data". United States Census Bureau. Retrieved August 25, 2021.

[GR6-2] "Find a County". National Association of Counties. Archived from the original on May 31, 2011. Retrieved June 7, 2011.

[3] "Disappearing Missouri Names". The Kansas City Star. March 19, 1911. p. 15. Retrieved August 15, 2014 – via Newspapers.com.

[4] Eaton, David Wolfe (1916). How Missouri Counties, Towns and Streams Were Named. The State Historical Society of Missouri. pp. 202.

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