One hundred seventy species in 57 lichen genera are reported from the Parashant National Monument. Collections were made from 16 sites visited during the study. Data reported in this study correlates with previous studies from the surrounding areas, and 38 species are reported as new to this region in northwestern Arizona. In addition, a second record of Letharia vulpina is reported for the state. The data presented here serve as a baseline for future studies related to lichen biodiversity or air quality monitoring in northwestern Arizona.