. 9 %) ▁had ▁someone ▁living ▁alone ▁who ▁was ▁ 6 5 ▁years ▁of ▁age ▁or ▁older . ▁The ▁average ▁household ▁size ▁was ▁ 2 . 2 6 . ▁There ▁were ▁ 1 5 1 , 0 2 9 ▁families ▁( 4 3 . 7 % ▁of ▁all ▁households ); ▁the ▁average ▁family ▁size ▁was ▁ 3 . 1 1 . ▁ ▁There ▁were ▁ 3 7 6 , 9 4 2 ▁housing ▁units , ▁at ▁an ▁average ▁density ▁of ▁ 1 , 6 2 5 . 5 ▁per ▁square ▁mile ▁( 6 2 7 . 6 / km 2 ), ▁of ▁which ▁ 1 2 3 , 6 4 6 ▁( 3 5 . 8 %) ▁were ▁owner - occup ied , ▁and ▁ 2 2 2 , 1 6 5 ▁( 6 4 . 2 %) ▁were ▁occupied ▁by ▁rent ers . ▁The ▁home owner ▁vac ancy ▁rate ▁was ▁ 2 . 3 %; ▁the ▁r ental ▁vac ancy ▁rate ▁was ▁ 5 . 4 %. ▁ 3 2 7 , 9 8 5 ▁people ▁( 4 0 . 7 % ▁of ▁the ▁population ) ▁lived ▁in ▁owner - occup ied ▁housing ▁units ▁and ▁ 4 5 2 , 9 8 6 ▁people ▁( 5 6 . 3 %) ▁lived ▁in ▁r ental ▁housing ▁units . ▁ ▁According ▁to ▁the ▁ 2 0 0 5 ▁American ▁Community ▁Survey , ▁San ▁Francisco ▁has ▁the ▁highest ▁percentage ▁of ▁gay ▁and ▁les bian ▁individuals ▁of ▁any ▁of ▁the ▁ 5 0 ▁largest ▁U .