Coconino County, Arizona
Old Coconino County Courthouse in Flagstaff
Location within the U.S. state of Arizona
Arizona's location within the U.S.
|Founded||February 18, 1891|
|• Total||18,661 sq mi (48,330 km2)|
|• Land||18,619 sq mi (48,220 km2)|
|• Water||43 sq mi (110 km2) 0.2%%|
| • Estimate |
|• Density||7.2/sq mi (2.8/km2)|
|Time zone||UTC−7 ( Mountain)|
Coconino County is a county located in the north central part of the U.S. state of Arizona. The population was 134,421 at the 2010 census.  The county seat is Flagstaff.  The county takes its name from Cohonino,  a name applied to the Havasupai. It is the second-largest county by area in the contiguous United States, behind San Bernardino County, California, with its 18,661 square miles (48,300 km2), or 16.4% of Arizona's total area, making it larger than each of the nine smallest states.
Coconino County comprises the Flagstaff, Arizona Metropolitan Statistical Area.
Coconino County contains Grand Canyon National Park, the Havasupai Nation, and parts of the Navajo Nation, Hualapai Nation, and Hopi Nation. It has a relatively large Native American population at nearly 30% of the county's total population, being mostly Navajo with smaller numbers of Havasupai, Hopi, and others.
After the building of the Atlantic & Pacific Railroad in 1883 the region of northern Yavapai County began experiencing rapid growth. The people of the northern reaches had tired of the rigors of travelling all the way to Prescott for county business. They also believed that they were a significant enough entity that they should have their own county jurisdiction. Therefore, they decided in 1887 to petition for secession from Yavapai and the creation of a new Frisco County. They remained part of Yavapai, however, until 1891 when Coconino County was formed and its seat declared to be Flagstaff.
According to the U.S. Census Bureau, the county has a total area of 18,661 square miles (48,330 km2), of which 18,619 square miles (48,220 km2) is land and 43 square miles (110 km2) (0.2%) is water.  It is the largest county by area in Arizona and the second-largest county in the United States (excluding boroughs in Alaska) after San Bernardino County in California. It has more land area than each of the following U.S. states: Connecticut, Delaware, Hawaii, Maryland, Massachusetts, New Hampshire, New Jersey, Rhode Island, and Vermont.
- Mohave County – west
- Yavapai County – south
- Gila County – south
- Navajo County – east
- San Juan County, Utah – northeast
- Kane County, Utah – north
Coconino County has 7,142.42 square miles (18,498.8 km2) of federally designated Indian reservation, second only to Apache County. In descending order of area within the county, the reservations are the Navajo Nation, Hualapai Indian Reservation, Hopi Indian Reservation, Havasupai Indian Reservation, and the Kaibab Indian Reservation. The Havasupai Reservation is the only one that lies entirely within the county's borders.
- Apache-Sitgreaves National Forest (part)
- Coconino National Forest (part)
- Glen Canyon National Recreation Area (part)
- Grand Canyon National Park (part)
- Kaibab National Forest (part)
- Prescott National Forest (part)
- Sunset Crater Volcano National Monument
- Vermilion Cliffs National Monument
- Walnut Canyon National Monument
- Wupatki National Monument
|U.S. Decennial Census
1790–1960  1900–1990 
1990–2000  2010–2018 
As of the 2000 census, there were 116,320 people, 40,448 households, and 26,938 families living in the county. The population density was 6 people per square mile (2/km2). There were 53,443 housing units at an average density of 3 per square mile (1/km2). The racial makeup of the county was 63.1% White, 28.5% Native American, 1.0% Black or African American, 0.8% Asian, 0.1% Pacific Islander, 4.1% from other races, and 2.4% from two or more races. 10.9% of the population were Hispanic or Latino of any race. 18.6% reported speaking Navajo at home, while 6.6% speak Spanish. 
There were 40,448 households out of which 34.9% had children under the age of 18 living with them, 49.7% were married couples living together, 12.2% had a female householder with no husband present, and 33.4% were non-families. 22.1% of all households were made up of individuals and 4.5% had someone living alone who was 65 years of age or older. The average household size was 2.80 and the average family size was 3.36.
In the county, the population was spread out with 28.7% under the age of 18, 14.4% from 18 to 24, 29.2% from 25 to 44, 20.7% from 45 to 64, and 7.0% who were 65 years of age or older. The median age was 30 years. For every 100 females there were 99.70 males. For every 100 females age 18 and over, there were 97.20 males.
The median income for a household in the county was $38,256, and the median income for a family was $45,873. Males had a median income of $32,226 versus $25,055 for females. The per capita income for the county was $17,139. About 13.1% of families and 18.2% of the population were below the poverty line, including 22.3% of those under age 18 and 13.3% of those age 65 or over.
As of the 2010 census, there were 134,421 people, 46,711 households, and 29,656 families living in the county.  The population density was 7.2 inhabitants per square mile (2.8/km2). There were 63,321 housing units at an average density of 3.4 per square mile (1.3/km2).  The racial makeup of the county was 61.7% White (55.2% non-Hispanic White), 27.3% American Indian, 1.4% Asian, 1.2% Black or African American, 0.1% Pacific islander, 5.2% from other races, and 3.1% from two or more races. Those of Hispanic or Latino origin made up 13.5% of the population.  The largest ancestry groups were: 
Of the 46,711 households, 33.1% had children under the age of 18 living with them, 45.0% were married couples living together, 12.7% had a female householder with no husband present, 36.5% were non-families, and 24.5% of all households were made up of individuals. The average household size was 2.69 and the average family size was 3.26. The median age was 31.0 years. 
The median income for a household in the county was $49,510 and the median income for a family was $58,841. Males had a median income of $42,331 versus $31,869 for females. The per capita income for the county was $22,632. About 11.6% of families and 18.6% of the population were below the poverty line, including 22.5% of those under age 18 and 13.8% of those age 65 or over. 
- Havasupai Indian Reservation
- Hopi Reservation
- Hualapai Indian reservation
- Kaibab Indian Reservation
- Navajo Nation
|Rank||City/Town/etc.||Population (2010 Census)||Municipal type||Incorporated|
|2||Sedona (mostly in Yavapai County)||10,031||City||1988|
|8||Grand Canyon Village||2,004||CDP|
|23||Winslow West (mostly in Navajo County)||438||CDP|
|26||Kaibab (mostly in Mohave County)||124||CDP|
Coconino County has trended towards the Democratic Party in modern times after being a Republican stronghold between the 1950s and 1980s. It was won by every Republican Presidential nominee between 1952 and 1988; however no Republican since George H. W. Bush in 1988 has managed to come within six percentage points of reclaiming the county.
Flagstaff in Coconino County is a major highway junction, with Interstate 40 extending to the east and the west (connecting with Williams and Winslow, Arizona, for example), and with Interstate 17 extending south from Flagstaff to Phoenix and Maricopa County. U.S. Routes 89 and 180 extend north from Flagstaff and connect it with the Grand Canyon National Park.
Flagstaff Pulliam Airport is a public airport located four miles (6 km) south of the central business district of Flagstaff, it is mostly used for general aviation but is also served by two commercial airlines.
The Mountain Line provides public transportation bus service in the Flagstaff area.
- National Register of Historic Places listings in Coconino County, Arizona
- USS Coconino County (LST-603)
- "State & County QuickFacts". United States Census Bureau. Retrieved May 18, 2014.
- "Find a County". National Association of Counties. Archived from the original on May 31, 2011. Retrieved June 7, 2011.
- "History of Coconino".
- "2010 Census Gazetteer Files". United States Census Bureau. August 23, 2012. Retrieved August 23, 2015.
- "Population and Housing Unit Estimates". Retrieved May 10, 2019.
- "U.S. Decennial Census". United States Census Bureau. Retrieved May 18, 2014.
- "Historical Census Browser". University of Virginia Library. Retrieved May 18, 2014.
- "Population of Counties by Decennial Census: 1900 to 1990". United States Census Bureau. Retrieved May 18, 2014.
- "Census 2000 PHC-T-4. Ranking Tables for Counties: 1990 and 2000" (PDF). United States Census Bureau. Retrieved May 18, 2014.
- "Language Map Data Center".
- "DP-1 Profile of General Population and Housing Characteristics: 2010 Demographic Profile Data". United States Census Bureau. Archived from the original on February 13, 2020. Retrieved January 20, 2016.
- "Population, Housing Units, Area, and Density: 2010 – County". United States Census Bureau. Archived from the original on February 13, 2020. Retrieved January 20, 2016.
- "DP02 Selected Social Characteristics in the United States – 2006–2010 American Community Survey 5-Year Estimates". United States Census Bureau. Archived from the original on February 13, 2020. Retrieved January 20, 2016.
- "DP03 Selected Economic Characteristics – 2006–2010 American Community Survey 5-Year Estimates". United States Census Bureau. Archived from the original on February 13, 2020. Retrieved January 20, 2016.
- Promotions, Center for New Media and. "US Census Bureau 2010 Census".
- Geography, US Census Bureau. "2010 Census Block Maps".
- "Dave Leip's Atlas of United States Presidential Elections". Retrieved June 11, 2011.
- Scammon, Richard M. (compiler); America at the Polls: A Handbook of Presidential Election Statistics 1920–1964; pp. 42–44 ISBN 0405077114
- " Our Location Archived July 11, 2011, at the Wayback Machine." Grand Canyon Airlines. Retrieved on October 3, 2009.
- " Locate Us Archived March 23, 2009, at the Wayback Machine." Air Grand Canyon. Retrieved on October 3, 2009.
|Wikimedia Commons has media related to Coconino County, Arizona.|
- Geographic data related to Coconino County, Arizona at OpenStreetMap
- Official website
- Coconino County profile at Arizona Department of Commerce
- Geologic Map of the Eastern Quarter of the Flagstaff 30ʹ x 60ʹ Quadrangle, Coconino County, Northern Arizona United States Geological Survey