Navajo County is located in the northern part of Arizona. The county seat is Holbrook. Navajo County has an area of 6,343,040 acres which is laid off in a fifty mile wide stretch two hundred twenty five miles long.

Navajo County was formed on March 21, 1895, as the act of the Territorial Assembly before it adjourned at midnight.

The county is divided into two distinct parts by the Mogollon Rim. The high country in the northern part of the county is arid and desert-like with mesas and plateaus. The southern part is rugged mountain area, heavily wooded with pinon juniper and ponderosa pine.