ZIP code 21529 is officially located in the state of Maryland, primarily serving the city of Ellerslie. It falls under the administrative jurisdiction of Allegany County. When planning mail delivery, logistics routing, or demographic research, 21529 operates within the Eastern Time (ET) timezone and supports the 403 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 21529 ZIP Code Tabulation Area is approximately 20,703. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $133,529.