ZIP code 03810 is officially located in the state of New hampshire, primarily serving the city of Alton bay. It falls under the administrative jurisdiction of Belknap County. When planning mail delivery, logistics routing, or demographic research, 03810 operates within the Eastern Time (ET) timezone and supports the 642 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 03810 ZIP Code Tabulation Area is approximately 24,442. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $110,810.