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Kodiak Island Borough, AK, has experienced a slight population decline, with a 1.2% decrease over the past year and a 0.18% annual decline over the last 13 years. The median age is 35.1, slightly younger than the state average of 35.3. The sex ratio is notably high at 115.1, indicating a larger male population. The age dependency ratio stands at 57, with 24% of residents under 18 and 12.3% over 65, reflecting a relatively balanced age distribution compared to other Alaskan counties, such as Kenai Peninsula Borough, which has a higher old-age dependency ratio of 31.4%.