ZIP code 21521 is officially located in the state of Maryland, primarily serving the city of Barton. It falls under the administrative jurisdiction of Allegany County. When planning mail delivery, logistics routing, or demographic research, 21521 operates within the Eastern Time (ET) timezone and supports the 366 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 21521 ZIP Code Tabulation Area is approximately 34,666. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $97,521.