Zip code 85340 is primarily located in Maricopa County. The official US Postal Service name for 85340 is LITCHFIELD PARK, Arizona. Portions of zip code 85340 are contained within or border the city limits of Litchfield Park, AZ, Goodyear, AZ, Glendale, AZ, Buckeye, AZ, Avondale, AZ, and Phoenix, AZ. The area code for zip code 85340 is 623.