OSM tag name=Sinclair Island matches Sinclair Island in these Wikidata fields:
| Islands of Puget Sound | place=islet, admin_level, place=island, boundary=administrative |
| Islands of Skagit County, Washington | place=islet, admin_level, place=island, boundary=administrative |
| Islands of Washington (state) | place=islet, admin_level, place=island, boundary=administrative |