Kodiak Island Borough area

Population and density of Kodiak Island Borough

The Census Bureau estimates that 12,387 people lived in Kodiak Island Borough on July 1, 2025. That ranks #2,331 of 3,222 county equivalents nationally and #8 of 30 in Alaska. Since the April 1, 2020 estimates base of 13,098, the population has declined by 711 (−5.4%), compared with +0.5% for Alaska as a whole.

With 6,689.9 square miles of land, that is 1.9 people per square mile (0.71 per km²), placing Kodiak Island Borough #3,079 nationally for density and #9 in Alaska. The median county equivalent has 47 people per square mile; the Alaska median is 0.73. Put another way, there are about 346 acres of land per resident.

U.S. Census Bureau, Vintage 2025 population estimates. Estimates are revised each year and are not decennial census counts. Density divides the whole population by the whole county’s land area, so it describes an average, not how settlement is distributed within the county. Population sources and methods.

Cities and towns in Kodiak Island Borough

6 incorporated places lie at least partly in Kodiak Island Borough. Together they are home to 5,841 people (47.2%); the other 6,546 (52.8%) live outside any incorporated place, in unincorporated communities and rural areas.

The largest is Kodiak city, with 5,281 residents in the county. By land, Old Harbor city is the largest at 16.2 mi².

Population: U.S. Census Bureau Vintage 2025 subcounty estimates, counting only the part of each place inside Kodiak Island Borough. Land: 2026 Census Gazetteer, for the whole place even where it extends into other counties. How communities are listed.

Metropolitan area

Kodiak Island Borough is not part of any metropolitan or micropolitan statistical area in the Office of Management and Budget’s July 2023 delineation; 1,306 other county equivalents are also outside one. These areas are built around an urban core of at least 10,000 people plus the counties tied to it by commuting, so counties outside them are generally rural.

ZIP codes

6 ZIP Code Tabulation Areas have land in Kodiak Island Borough, and each lies mostly inside the county.

995509960899615996249964399644

ZIP Code Tabulation Areas are the Census Bureau’s approximations of USPS ZIP Code service areas, from the 2020 Census relationship files. Post-office-box and single-address ZIP Codes have no tabulation area.

Counties bordering Kodiak Island Borough

Kodiak Island Borough shares a land border with 2 county equivalents. Each of them has more land than Kodiak Island Borough. The largest neighbor is Lake and Peninsula Borough (23,896.5 mi²) and the smallest is Kenai Peninsula Borough (16,017.1 mi²). Together with its neighbors, Kodiak Island Borough forms a block of 46,603.5 mi² of land, of which it holds 14.4%.

How big is Kodiak Island Borough compared with U.S. states?

Kodiak Island Borough has more land than 4 of the 50 states. It is about 1 times the land area of Hawaii (6,422.6 mi²), while New Jersey, the next larger state, has 1.1 times as much land (7,355 mi²). Alaska’s county land could hold about 85 areas the size of Kodiak Island Borough.

Another way to picture it: the same land area would fill a square about 81.8 miles (131.6 km) on each side. Real county shapes are rarely square, so this is a scale reference rather than a width or driving distance.

State figures are the sums of each state’s county-equivalent land measurements in the same Census release, so states and counties are compared on the same basis. Published state totals can differ slightly because of rounding. Compare all states · Counties bigger than entire states.

What stands out about Kodiak Island Borough?

Kodiak Island Borough has more land than 3,174 of the other 3,221 county equivalents in the dataset.

A median is the middle county-equivalent measurement, not the average of the largest and smallest. All three bars use the same linear scale. Very small areas may appear as a thin sliver; the labels retain their values.

Does including water change its rank?

Using land plus water places Kodiak Island Borough at #22 nationally by total area, 26 places closer to the top than its land rank. The water assigned to this geography moves it ahead of some county equivalents with more land.

Its water share is 44.9%, compared with a national county-equivalent median of 1.2% — 43.8 percentage points higher. This describes the statistical geography’s land/water mix, not flood exposure or developable land.

Closest positions in the national land ranking

These entries sit immediately beside Kodiak Island Borough in the national ranking. They can be in different states and are not necessarily geographic neighbors.

Calculated from the same Census release as the area table. Total-area order uses original ALAND + AWATER; water shares and chart labels use published square miles. Calculation details.