ZIP code 51640 is officially located in the state of Missouri, primarily serving the city of . It falls under the administrative jurisdiction of Atchison County. When planning mail delivery, logistics routing, or demographic research, 51640 operates within the Central Time (CT) timezone and supports the 759 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 51640 ZIP Code Tabulation Area is approximately 18,259. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $120,640.