Kodiak Island Borough (Russian: Остров Кадьяк) is a borough in the U.S. state of Alaska. At the 2020 census, the population was 13,101, down from 13,592 in 2010. The borough seat is Kodiak.

The borough has a total area of 12,022 square miles (31,140 km), of which 6,550 square miles (17,000 km) is land and 5,472 square miles (14,170 km) (45.5%) is water. Most of the land area belongs to Kodiak Island, but a thin strip of coastal area on the western part of the Alaska Peninsula and other nearby islands (Afognak Island, Shuyak Island, Marmot Island, Raspberry Island, Little Raspberry Island, Whale Island, Spruce Island, Woody Island, Uganik Island, Sitkalidak Island, Tugidak Island, Sitkinak Island, Chirikof Island, and the Semidi Islands) are also in the borough. The waterway between the island and mainland is known as the Shelikof Strait. South of the island are the open waters of the Pacific Ocean, so the site is considered good for launching certain types of satellites. The Kodiak Launch Complex is ideal for putting satellites in Molniya and polar orbits.

• Kenai Peninsula Borough, Alaska - north
• Lake and Peninsula Borough, Alaska - northwest

• Alaska Maritime National Wildlife Refuge (parts of Alaska Peninsula and Gulf of Alaska units)
  • Barren Islands
  • Semidi Wilderness
    • Semidi Islands
  • Trinity Islands
    • Sitkinak Island
    • Tugidak Island
• Alaska Peninsula National Wildlife Refuge (part)
• Becharof National Wildlife Refuge (part)
  • Becharof Wilderness (part)
• Chugach National Forest (part)
• Katmai National Park and Preserve (part)
  • Katmai Wilderness (part)
• Kodiak National Wildlife Refuge

Historical population

Census	Pop.	Note	%±
1960	7,174		—
1970	9,409		31.2%
1980	9,939		5.6%
1990	13,309		33.9%
2000	13,913		4.5%
2010	13,592		−2.3%
2020	13,101		−3.6%
2023 (est.)	12,565		−4.1%
U.S. Decennial Census 1790-1960 1900-1990 1990-2000 2010-2020

As of the census of 2000, there were 13,913 people, 4,424 households, and 3,256 families residing in the borough. The population density was 2 people per square mile (0.77 people/km). There were 5,159 housing units at an average density of 1 per square mile (0.39/km). The racial makeup of the borough was 59.69% White, 0.96% Black or African American, 14.58% Native American, 16.04% Asian, 0.79% Pacific Islander, 2.78% from other races, and 5.16% from two or more races. 6.10% of the population were Hispanic or Latino of any race. 13.10% reported speaking Tagalog at home, a language of the Philippines, while 5.28% speak Spanish.

There were 4,424 households, out of which 45.90% had children under the age of 18 living with them, 59.70% were married couples living together, 8.80% had a female householder with no husband present, and 26.40% were non-families. 19.90% of all households were made up of individuals, and 3.70% had someone living alone who was 65 years of age or older. The average household size was 3.07 and the average family size was 3.52.

In the borough the population was spread out, with 32.40% under the age of 18, 8.30% from 18 to 24, 34.00% from 25 to 44, 20.40% from 45 to 64, and 4.80% who were 65 years of age or older. The median age was 32 years. For every 100 females, there were 112.40 males. For every 100 females age 18 and over, there were 117.40 males.

• Akhiok
• Kodiak (Borough seat)
• Larsen Bay
• Old Harbor
• Ouzinkie
• Port Lions

• Aleneva
• Chiniak
• Karluk
• Kodiak Station
• Mill Bay
• Womens Bay

United States presidential election results for Kodiak Island Borough, Alaska

Year	Republican		Democratic		Third party(ies)
	No.	%	No.	%	No.	%
2020	3,756	56.84%	2,523	38.18%	329	4.98%
2016	3,071	56.11%	2,001	36.56%	401	7.33%
2012	2,969	57.46%	2,056	39.79%	142	2.75%
2008	3,979	63.40%	2,102	33.49%	195	3.11%
2004	2,698	65.45%	1,349	32.73%	75	1.82%
2000	3,861	65.46%	1,543	26.16%	494	8.38%
1996	2,708	55.95%	1,576	32.56%	556	11.49%
1992	2,293	41.80%	1,471	26.82%	1,721	31.38%
1988	2,608	64.24%	1,349	33.23%	103	2.54%
1984	3,212	69.74%	1,237	26.86%	157	3.41%
1980	1,589	47.83%	1,028	30.95%	705	21.22%
1976	1,491	56.63%	1,014	38.51%	128	4.86%
1972	1,172	56.10%	859	41.12%	58	2.78%
1968	987	47.11%	861	41.10%	247	11.79%
1964	399	25.22%	1,183	74.78%	0	0.00%
1960	631	42.12%	867	57.88%	0	0.00%

Kodiak Island Borough is strongly Republican, having last voted for a Democrat in 1964.

• List of airports in the Kodiak Island Borough

• Official website
• Kodiak Island Public Access Atlas (Alaska DNR)
• Borough map: Alaska Department of Labor

57°43′N 153°47′W / 57.71°N 153.78°W / 57.71; -153.78