ZIP code 66603 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, 66603 operates within the Central Time (CT) timezone and supports the 822 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 66603 ZIP Code Tabulation Area is approximately 6,422. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $91,603.