ZIP code 20689 is officially located in the state of Maryland, primarily serving the city of Sunderland. It falls under the administrative jurisdiction of Calvert County. When planning mail delivery, logistics routing, or demographic research, 20689 operates within the Eastern Time (ET) timezone and supports the 292 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 20689 ZIP Code Tabulation Area is approximately 11,492. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $53,689.