ZIP code 21042 is officially located in the state of Maryland, primarily serving the city of Ellicott city. It falls under the administrative jurisdiction of Howard County. When planning mail delivery, logistics routing, or demographic research, 21042 operates within the Eastern Time (ET) timezone and supports the 539 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 21042 ZIP Code Tabulation Area is approximately 3,339. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $54,042.