Coconino County is located in the north central part of the state of Arizona. As of 2000 its population was 116,320. It is the second largest county by land area in the 48 continguous United States, behind San Bernardino County, California. The county seat is Flagstaff. Coconino County contains Grand Canyon National Park, the Havasupai Nation, and parts of the Navajo Nation, Hualapai Nation, and Hopi Nation. It takes its name from Cosnino, a name applied to the Havasupai.

According to the U.S. Census Bureau, the county has a total area of 48,332 km² (18,661 mi²). 48,219 km² (18,617 mi²) of it is land and 113 km² (44 mi²) of it is water. The total area is 0.23% water. It is therefore physically larger than Denmark, which has a population of almost six million people, and has more land area than four U.S. states

As of the census2 of 2000, 40,448 households, and 26,938 families residing in the county. The population density is 2/km² (6/mi²). There are 53,443 housing units at an average density of 1/km² (3/mi²). The racial makeup of the county is 63.09% White, 28.51% Native American, 1.04% Black or African American, 0.78% Asian, 0.09% Pacific Islander, 4.13% from other races, and 2.36% from two or more races. 10.94% of the population are Hispanic or Latino of any race.

The median income for a household in the county is $38,256, and the median income for a family is $45,873. Males have a median income of $32,226 versus $25,055 for females. The per capita income for the county is $17,139. 18.20% of the population and 13.10% of families are below the poverty line. Out of the total population, 22.30% of those under the age of 18 and 13.30% of those 65 and older are living below the poverty line.

Neighboring areas include: Kane County in Utah, San Juan County in Utah, Navajo County, Gila County, Yavapai County, and Mohave County.