ZIP code 01011 is officially located in the state of Massachusetts, primarily serving the city of Chester. It falls under the administrative jurisdiction of Hampden County. When planning mail delivery, logistics routing, or demographic research, 01011 operates within the Eastern Time (ET) timezone and supports the 360 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 01011 ZIP Code Tabulation Area is approximately 20,660. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $127,011.