ZIP code 06423 is officially located in the state of Connecticut, primarily serving the city of East haddam. It falls under the administrative jurisdiction of Middlesex County. When planning mail delivery, logistics routing, or demographic research, 06423 operates within the Eastern Time (ET) timezone and supports the 455 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 06423 ZIP Code Tabulation Area is approximately 34,755. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $131,423.