I went to the Geographic Names Information System at https://edits.nationalmap.gov/apps/gaz-domestic/public/search/names https://edits.nationalmap.gov/apps/gaz-

I went to the Geographic Names Information System at https://edits.nationalmap.gov/apps/gaz-domestic/public/search/names https://edits.nationalmap.gov/apps/gaz-domestic/public/searc... Name search, Names search mode is "Exact Match", Feature Classes is "Island". State (FIPS) of "California (O6)" gives 522 named places. State (FIPS) of "Washington (53)" gives 422 named places. Note that this list includes river and lake islands, including islands in reservoirs. There are two islands named "The Island" in California, neither in Wikipedia, and the one at 41.0922983, -121.4803677 does not appear to be an island.