▁States ▁Census ▁Bureau , ▁the ▁town ▁has ▁a ▁total ▁area ▁of ▁. ▁ ▁of ▁it ▁is ▁land ▁and ▁ ▁of ▁it ▁( 4 7 . 4 2 %) ▁is ▁water . ▁ ▁S urr ounding ▁areas ▁▁ ▁Bal ▁Har bour ▁▁ ▁Bay ▁Har bor ▁Islands ▁▁▁ ▁Atlantic ▁Ocean ▁ ▁Bay ▁Har bor ▁Islands , ▁Indian ▁Creek ▁▁ ▁Atlantic ▁Ocean ▁▁ ▁Miami ▁Beach ▁▁▁ ▁Atlantic ▁Ocean ▁▁ ▁Miami ▁Beach ▁ ▁Dem ograph ics ▁ ▁As ▁of ▁ 2 0 1 0 , ▁there ▁were ▁ 3 , 8 9 0 ▁households ▁out ▁of ▁which ▁ 3 2 . 9 % ▁were ▁vac ant . ▁In ▁ 2 0 0 0 , ▁ 2 0 . 5 % ▁had ▁children ▁under ▁the ▁age ▁of ▁ 1 8 ▁living ▁with ▁them , ▁ 4 6 . 6 % ▁were ▁married ▁cou ples ▁living ▁together , ▁ 9 . 6 % ▁had ▁a ▁female ▁house holder ▁with ▁no ▁husband ▁present , ▁and ▁ 4 0 . 8 % ▁were ▁non - famil ies . ▁ 3 2 . 9 % ▁of ▁all ▁households ▁were ▁made ▁up ▁of ▁individuals ▁and ▁ 1 5 . 1 % ▁had ▁someone ▁living ▁alone ▁who ▁was ▁ 6 5 ▁years ▁of ▁age ▁or ▁older . ▁The ▁average ▁household ▁size ▁was ▁ 2 . 1 8 ▁and ▁the ▁average ▁family ▁size ▁was ▁ 2 . 7 5 . ▁ ▁In ▁ 2 0 0 0 , ▁the ▁town ' s ▁population ▁was ▁spread ▁out ▁with ▁ 1 6 . 3 % ▁under ▁the