ZIP code 66604 is officially located in the state of Kansas, primarily serving the city of Topeka. It falls under the administrative jurisdiction of Shawnee County. When planning mail delivery, logistics routing, or demographic research, 66604 operates within the Central Time (CT) timezone and supports the 802 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 66604 ZIP Code Tabulation Area is approximately 35,802. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $108,604.