ZIP code 02558 is officially located in the state of Massachusetts, primarily serving the city of Onset. It falls under the administrative jurisdiction of Plymouth County. When planning mail delivery, logistics routing, or demographic research, 02558 operates within the Eastern Time (ET) timezone and supports the 334 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 02558 ZIP Code Tabulation Area is approximately 25,534. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $126,558.