ZIP code 01337 is officially located in the state of Massachusetts, primarily serving the city of Leyden. It falls under the administrative jurisdiction of Franklin County. When planning mail delivery, logistics routing, or demographic research, 01337 operates within the Eastern Time (ET) timezone and supports the 319 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 01337 ZIP Code Tabulation Area is approximately 23,419. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $69,337.