5   square ▁miles ▁( 3 2 5 . 0   km ² ), ▁of ▁which , ▁ 2 5 . 5   square ▁miles ▁( 6 6 . 0   km ² ) ▁of ▁it ▁is ▁land ▁and ▁ 1 0 0 . 0   square ▁miles ▁( 2 5 9 . 0   km ² ) ▁of ▁it ▁( 7 9 . 6 9 %) ▁is ▁water . ▁ ▁The ▁land ▁area ▁is ▁composed ▁of ▁Pl um ▁Island , ▁Detroit ▁Island , ▁Washington ▁Island , ▁Hog ▁Island , ▁Pil ot ▁Island , ▁Fish ▁Island , ▁and ▁Rock ▁Island . ▁Washington ▁Island ▁is ▁the ▁largest ▁in ▁a ▁chain ▁of ▁islands ▁( which ▁are ▁collect ively ▁referred ▁to ▁as ▁the ▁Pot aw atom i ▁Islands ) ▁extending ▁across ▁Lake ▁Michigan ▁between ▁the ▁Do or ▁Pen ins ula ▁in ▁Wisconsin ▁and ▁the ▁Garden ▁Pen ins ula ▁in ▁D elta ▁County , ▁Michigan . ▁These ▁islands ▁are ▁out cro ppings ▁of ▁the ▁Ni ag ara ▁Esc arp ment . ▁ ▁Dem ograph ics ▁The ▁ 2 0 1 0 ▁US ▁Census ▁lists ▁ 7 0 8 ▁residents . ▁ ▁In ▁the ▁older ▁ 2 0 0 0 ▁census , ▁there ▁were ▁ 6 6 0 ▁people , ▁ 2 9 3 ▁households ▁and ▁ 1 9 8 ▁families ▁res iding ▁in ▁the ▁town . ▁The ▁population ▁density ▁was ▁ 2 5 . 9 ▁people ▁per ▁square ▁mile ▁( 1 0 . 0 / km ²). ▁ ▁There ▁were ▁ 9 0 3 ▁housing ▁units ▁at