ZIP code 91761 is officially located in the state of California, primarily serving the city of Ontario. It falls under the administrative jurisdiction of San Bernardino County. When planning mail delivery, logistics routing, or demographic research, 91761 operates within the Pacific Time (PT) timezone and supports the 206 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 91761 ZIP Code Tabulation Area is approximately 20,506. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $77,761.