ZIP code 21723 is officially located in the state of Maryland, primarily serving the city of Cooksville. It falls under the administrative jurisdiction of Howard County. When planning mail delivery, logistics routing, or demographic research, 21723 operates within the Eastern Time (ET) timezone and supports the 398 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 21723 ZIP Code Tabulation Area is approximately 33,998. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $131,723.