ZIP code 21403 is officially located in the state of Maryland, primarily serving the city of Annapolis. It falls under the administrative jurisdiction of Anne Arundel County. When planning mail delivery, logistics routing, or demographic research, 21403 operates within the Eastern Time (ET) timezone and supports the 355 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 21403 ZIP Code Tabulation Area is approximately 14,355. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $91,403.