Kalgin Island is an island in Cook Inlet of the Gulf of Alaska, southwest of the city of Kenai, Alaska, United States. It is part of the Kenai Peninsula Borough and has a land area of 58.722 km² (22.673 sq mi), is 11.5 nm long and reported an official resident population of one person as of the 2000 census.
- Kalgin Island: Block 1052, Census Tract 1, Kenai Peninsula Borough, Alaska United States Census Bureau
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