ZIP code 04423 is officially located in the state of Maine, primarily serving the city of Costigan. It falls under the administrative jurisdiction of Penobscot County. When planning mail delivery, logistics routing, or demographic research, 04423 operates within the Central Time (CT) timezone and supports the 805 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 04423 ZIP Code Tabulation Area is approximately 40,705. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $131,423.