ZIP code 91103 is officially located in the state of California, primarily serving the city of Pasadena. It falls under the administrative jurisdiction of Los Angeles County. When planning mail delivery, logistics routing, or demographic research, 91103 operates within the Pacific Time (PT) timezone and supports the 827 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 91103 ZIP Code Tabulation Area is approximately 5,727. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $91,103.