An inmate register reveals that there were 1,576 prisoners in total held at Alcatraz during its time as a Federal Penitentiary, although figures reported have varied and some have stated 1557.
Et register over de indsatte viser, at der har været 1.576 fanger på Alcatraz i alt i løbet af dets tid som statsfængsel; nogle kilder oplyser dog et tal på 1.557.