ZIP code 91743 is officially located in the state of California, primarily serving the city of Guasti. It falls under the administrative jurisdiction of San Bernardino County. When planning mail delivery, logistics routing, or demographic research, 91743 operates within the Central Time (CT) timezone and supports the 264 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 91743 ZIP Code Tabulation Area is approximately 12,164. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $71,743.