ZIP code 03031 is officially located in the state of New hampshire, primarily serving the city of Amherst. It falls under the administrative jurisdiction of Hillsborough County. When planning mail delivery, logistics routing, or demographic research, 03031 operates within the Eastern Time (ET) timezone and supports the 343 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 03031 ZIP Code Tabulation Area is approximately 39,543. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $67,031.