Atchison (ACH-i-suhn), county (435 sq mi/1,127 sq km; 1990 pop. 16,932), NE Kansas; Atchison; 39°31'N 95°18'W. Gently rolling agr. area, bounded E by Mo. (across Mo. R.); drained by Del. R. Livestock; corn, wheat, sorghum, soybeans, hay; grain milling. Oil. Formed 1855.
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