▁a ▁total ▁area ▁of ▁ 2 1 . 8   square ▁miles ▁( 5 6 . 5   km 2 ), ▁of ▁which , ▁ 2 1 . 4   square ▁miles ▁( 5 5   km 2 ) ▁of ▁it ▁is ▁land ▁and ▁ 0 . 4   square ▁miles ▁( 1   km 2 ) ▁of ▁it ▁( 1 . 8 3 %) ▁is ▁water . ▁▁ ▁The ▁town ship ▁surr ounds ▁El m h urst ▁Township . ▁ ▁Hence , ▁El m h urst ▁Township ▁is ▁an ▁enc lave ▁of ▁Ro aring ▁Brook ▁Township . ▁ ▁Dem ograph ics ▁ ▁As ▁of ▁the ▁census ▁of ▁ 2 0 1 0 , ▁there ▁were ▁ 1 , 9 0 7 ▁people , ▁ 7 2 8 ▁households , ▁and ▁ 5 7 1 ▁families ▁res iding ▁in ▁the ▁town ship . ▁ ▁The ▁population ▁density ▁was ▁ 8 9 . 1 ▁people ▁per ▁square ▁mile . ▁ ▁There ▁were ▁ 7 5 9 ▁housing ▁units ▁at ▁an ▁average ▁density ▁of ▁ 3 5 . 5 / sq   mi . ▁ ▁The ▁ra cial ▁make up ▁of ▁the ▁town ship ▁was ▁ 9 8 % ▁White , ▁ 0 . 5 % ▁African ▁American , ▁ 0 . 1 % ▁Pacific ▁Island er , ▁ 0 . 7 % ▁Asian , ▁ 0 . 2 % ▁from ▁other ▁races , ▁and ▁ 0 . 6 % ▁from ▁two ▁or ▁more ▁races . ▁His pan ic ▁or ▁Lat ino ▁of ▁any ▁race