▁n ort he astern ▁Lanc aster ▁County , ▁Pennsylvania , ▁United ▁States . ▁At ▁the ▁ 2 0 1 0 ▁census ▁the ▁population ▁was ▁ 1 0 , 3 1 0 . ▁ ▁History ▁C ocal ico ▁Township ▁was ▁divided ▁into ▁East ▁C ocal ico ▁and ▁West ▁C ocal ico ▁Town ships ▁in ▁ 1 8 3 8 . ▁The ▁Buch er ▁Th al ▁Historic ▁District ▁was ▁listed ▁on ▁the ▁National ▁Register ▁of ▁Historic ▁Places ▁in ▁ 1 9 8 7 . ▁ ▁Geography ▁According ▁to ▁the ▁U . S . ▁Census ▁Bureau , ▁the ▁town ship ▁has ▁a ▁total ▁area ▁of ▁, ▁all ▁of ▁it ▁land . ▁ ▁Dem ograph ics ▁As ▁of ▁the ▁census ▁of ▁ 2 0 0 0 , ▁there ▁were ▁ 9 , 9 5 4 ▁people , ▁ 3 , 4 6 1 ▁households , ▁and ▁ 2 , 7 0 9 ▁families ▁living ▁in ▁the ▁town ship . ▁ ▁The ▁population ▁density ▁was ▁ 4 8 2 . 9 ▁people ▁per ▁square ▁mile ▁( 1 8 6 . 5 / km ²). ▁ ▁There ▁were ▁ 3 , 5 5 7 ▁housing ▁units ▁at ▁an ▁average ▁density ▁of ▁ 1 7 2 . 6 / sq   mi ▁( 6 6 . 6 / km ²). ▁ ▁The ▁ra cial ▁make up ▁of ▁the ▁town ship ▁was ▁ 9 5 . 7 6 % ▁White , ▁ 0 . 4 7 % ▁Black ▁or ▁African ▁American , ▁ 0 . 1 1 % ▁Native ▁American ,