ZIP code 21561 is officially located in the state of Maryland, primarily serving the city of Swanton. It falls under the administrative jurisdiction of Garrett County. When planning mail delivery, logistics routing, or demographic research, 21561 operates within the Eastern Time (ET) timezone and supports the 330 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 21561 ZIP Code Tabulation Area is approximately 29,030. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $77,561.