Phantom islands are islands that are believed to exist and appear on maps for a period of time (sometimes centuries), and they are removed after they are proven not to exist (or the general population stops believing that they exist).
... with them, 54.9% are married couples living together, 5.6% have a female householder with no husband present, and 37.7% are non-families. 30.9% of all households are made up ...