ZIP code 21811 is officially located in the state of Maryland, primarily serving the city of Berlin. It falls under the administrative jurisdiction of Worcester County. When planning mail delivery, logistics routing, or demographic research, 21811 operates within the Eastern Time (ET) timezone and supports the 828 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 21811 ZIP Code Tabulation Area is approximately 28,128. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $127,811.