Flagstaff, AZ

ZIP code 86003 is for Flagstaff, Arizona. This area is home to famous landmarks such as the Lowell Observatory, where the dwarf planet Pluto was discovered in 1930. Another prominent feature is the beautiful Sunset Crater Volcano National Monument, showcasing a cinder cone volcano and lava flows. The region also boasts stunning views of the San Francisco Peaks, the highest mountain range in Arizona.