Yukon–Koyukuk Census Area (/ˈjuːkɒn ˈkaɪjəkək/) is a census area in the U.S. state of Alaska. As of the 2020 census, the population was 5,343,^[2] down from 5,588 in 2010.^[3] With an area of 147,842.51 sq mi (382,910.3 km²), it is the largest of any county or county-equivalent in the United States, or slightly larger than the entire state of Montana.^[4] It is part of the unorganized borough of Alaska and therefore has no borough seat. Its largest communities are the cities of Galena, in the west, and Fort Yukon, in the northeast.

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Yukon–Koyukuk Census Area
Unorganized Borough
White Mountains National Recreation Area
Location within the U.S. state of Alaska
Alaska's location within the U.S.
Coordinates: 65°17′N 151°39′W
Country	United States
State	Alaska
Established	1980[1]
Named for	Yukon River and Koyukuk River
Largest city	Fort Yukon
Area
• Total	147,805 sq mi (382,810 km2)
• Land	145,505 sq mi (376,860 km2)
• Water	2,300 sq mi (6,000 km2)  1.6%
Population  (2020)
• Total	5,179
• Density	0.038/sq mi (0.015/km2)
Time zone	UTC−9 (Alaska)
• Summer (DST)	UTC−8 (ADT)
Congressional district	At-large

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According to the U.S. Census Bureau, the census area has 147,805 square miles (382,810 km²), of which 145,505 square miles (376,860 km²) is land and 2,300 square miles (6,000 km²) (1.6%) is water.^[5] The area is slightly larger than the entire U.S. state of Montana, itself the fourth largest state, or the country of Japan, and makes up slightly more than 1/5 of the state of Alaska. The area is bigger than 47 of the other 49 states, with only California and Texas being bigger. Its population density, at 0.0449 inhabitants per square mile (0.0173/km²), is the lowest in the United States.

At the 2000 census there were 6,551 people, 2,309 households, and 1,480 families residing in the census area. The population density was 22.3 square miles (57.7km²) per person. It is the least densely populated county-equivalent of all 3,141 county-equivalents of the United States. There were 3,917 housing units at an average density of 0.027 per square mile (0.010/km²). The racial makeup of the census area was 24.27% White, 0.09% Black or African American, 70.89% Native American, 0.37% Asian, 0.05% Pacific Islander, 0.43% from other races, and 3.91% from two or more races. 1.19%^[12] were Hispanic or Latino of any race. 12.95% reported speaking an Athabaskan language at home; of these 35.26% speak Gwich’in and 10.94% speak Koyukon.^{[13][failed verification][clarification needed]}

Of the 2,309 households 38.90% had children under the age of 18 living with them, 36.90% were married couples living together, 16.90% had a female householder with no husband present, and 35.90% were non-families. 30.50% of households were one person and 6.20% were one person aged 65 or older. The average household size was 2.81 and the average family size was 3.53.

The age distribution was 35.00% under the age of 18, 8.70% from 18 to 24, 26.90% from 25 to 44, 22.10% from 45 to 64, and 7.30% 65 or older. The median age was 31 years. For every 100 females, there were 118.60 males. For every 100 females age 18 and over, there were 122.60 males.

School districts include:^[21]

• Alaska Gateway School District
• Galena City School District
• Iditarod Area School District
• Nenana City School District
• Tanana City School District
• Yukon Flats School District
• Yukon–Koyukuk School District

• List of airports in Yukon–Koyukuk Census Area
• Crow Lake (Alaska)