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Atchison County is the northwestern-most county in the state of Missouri. As of the 2010 US Census, the county had a population of 5,685. Its county seat is Rock Port. It was originally known as Allen County when it was detached from Holt County in 1843. The county was officially organized on February 14, 1845 and named for US Senator David Rice Atchison from Missouri.
Named for David Rice Atchison, United States senator.
County QuickFacts: CensusBureau Quick Facts
Organized February 14, 1845, from Holt County and The boundaries for Allen County were defined by the legislature in 1843 and attached to Holt County in 1845 and named in honor of David R. Atchison, who was then a senator from Missouri. (SESSION LAWS, 1844-1845, p. 34; Davis & Durrie, p. 316; HIST. HOLT & ATCH. 1882, p. 585; HIST. HARR. 1888, p. 182; BIOG. HIST. ATCH. p. 7; ATCH. CO. MAIL, Aug. 5, 1827, p. 1)
Source: Ewing, Martha K. "Place Names In The Northwest Counties Of Missouri." M.A. thesis., University of Missouri-Columbia, 1929.
As reported by the Census Bureau, the county has a total area of 550 square miles (1,400 km2), of which 547 square miles (1,420 km2) is
land and 2.8 square miles (7.3 km2) (0.5%) is water.
Atchison's western boundary for the most part is the Missouri River and Nebraska. An 1867 flood straightened a bend in the river north of Watson. Both Nebraska and Missouri claimed the 5,000 acre McKissick Island that extends almost two miles into Atchison County. The Supreme Court in 1904 decided that the land belongs to Nebraska. The only way Nebraskans can reach it by road is to cross the Missouri River and then travel through Missouri
Bordering counties are as follows:
Fairfax R-III School District - Fairfax
Rock Port R-II School District - Rock Port
Tarkio R-I School District - Tarkio
Tarkso Academy - Tarkio (07-12) - Nonsectarian (All Boys)