ZIP code 66780 is officially located in the state of Kansas, primarily serving the city of Walnut. It falls under the administrative jurisdiction of Crawford County. When planning mail delivery, logistics routing, or demographic research, 66780 operates within the Central Time (CT) timezone and supports the 387 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 66780 ZIP Code Tabulation Area is approximately 10,887. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $100,780.