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