ZIP code 21921 is officially located in the state of Maryland, primarily serving the city of Elkton. It falls under the administrative jurisdiction of Cecil County. When planning mail delivery, logistics routing, or demographic research, 21921 operates within the Eastern Time (ET) timezone and supports the 236 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 21921 ZIP Code Tabulation Area is approximately 33,836. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $97,921.