ZIP code 21917 is officially located in the state of Maryland, primarily serving the city of Colora. It falls under the administrative jurisdiction of Cecil County. When planning mail delivery, logistics routing, or demographic research, 21917 operates within the Eastern Time (ET) timezone and supports the 778 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 21917 ZIP Code Tabulation Area is approximately 32,278. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $129,917.