ZIP code 21638 is officially located in the state of Maryland, primarily serving the city of Grasonville. It falls under the administrative jurisdiction of Queen Annes County. When planning mail delivery, logistics routing, or demographic research, 21638 operates within the Eastern Time (ET) timezone and supports the 575 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 21638 ZIP Code Tabulation Area is approximately 20,175. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $86,638.