4 0 . 3 6 5 0 4 2 , ▁- 7 8 . 7 9 0 4 7 4 ), ▁in ▁the ▁valley ▁of ▁the ▁Little ▁Con em augh ▁River ▁at ▁the ▁confl u ence ▁of ▁its ▁South ▁F ork . ▁U . S . ▁Route ▁ 2 1 9 , ▁a ▁four - lane ▁express way , ▁passes ▁just ▁east ▁of ▁the ▁bor ough ▁and ▁leads ▁ ▁north ▁to ▁Eb ens burg , ▁the ▁Camb ria ▁County ▁seat . ▁John st own ▁is ▁ ▁to ▁the ▁south west , ▁and ▁Al to ona ▁is ▁about ▁ ▁to ▁the ▁n ortheast . ▁ ▁According ▁to ▁the ▁United ▁States ▁Census ▁Bureau , ▁the ▁bor ough ▁of ▁South ▁F ork ▁has ▁a ▁total ▁area ▁of ▁, ▁of ▁which ▁ ▁is ▁land ▁and ▁, ▁or ▁ 5 . 7 4 %, ▁is ▁water . ▁ ▁Dem ograph ics ▁ ▁As ▁of ▁the ▁census ▁of ▁ 2 0 0 0 , ▁there ▁were ▁ 1 , 1 3 8 ▁people , ▁ 4 5 2 ▁households , ▁and ▁ 3 1 1 ▁families ▁res iding ▁in ▁the ▁bor ough . ▁The ▁population ▁density ▁was ▁ 2 , 2 0 8 . 1 ▁people ▁per ▁square ▁mile ▁( 8 4 5 . 0 / km ²). ▁There ▁were ▁ 4 8 4 ▁housing ▁units ▁at ▁an ▁average ▁density ▁of ▁ 9 3 9 . 1 ▁per ▁square ▁mile ▁( 3 5 9 . 4 / km ²). ▁The ▁ra cial ▁make up ▁of ▁the ▁bor ough ▁was