ZIP code 21040 is officially located in the state of Maryland, primarily serving the city of Edgewood. It falls under the administrative jurisdiction of Harford County. When planning mail delivery, logistics routing, or demographic research, 21040 operates within the Eastern Time (ET) timezone and supports the 557 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 21040 ZIP Code Tabulation Area is approximately 41,857. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $120,040.