ZIP code 21648 is officially located in the state of Maryland, primarily serving the city of Madison. It falls under the administrative jurisdiction of Dorchester County. When planning mail delivery, logistics routing, or demographic research, 21648 operates within the Eastern Time (ET) timezone and supports the 280 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 21648 ZIP Code Tabulation Area is approximately 11,480. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $56,648.