Sinclair Island (Washington)
Sinclair Island is an island in the U.S. state of Washington. It is a part of, and lies off the western shore of mainland Skagit County. The island has a land area of 4.109 km² (1.586 sq mi) and is home to only a few private residents.
- Sinclair Island: Blocks 1029 thru 1036, Census Tract 9501, Skagit County, Washington United States Census Bureau
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