ZIP code 01861 is officially located in the state of Massachusetts, primarily serving the city of Merrimac. It falls under the administrative jurisdiction of Essex County. When planning mail delivery, logistics routing, or demographic research, 01861 operates within the Eastern Time (ET) timezone and supports the 294 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 01861 ZIP Code Tabulation Area is approximately Data Not Available. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $77,861.