ZIP code 18331 is officially located in the state of Pennsylvania, primarily serving the city of Gilbert. It falls under the administrative jurisdiction of Monroe County. When planning mail delivery, logistics routing, or demographic research, 18331 operates within the Eastern Time (ET) timezone and supports the 708 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 18331 ZIP Code Tabulation Area is approximately 8,408. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $67,331.