  cornwall is a borough in lebanon county, pennsylvania, united states. it is part of the lebanon, pa metropolitan statistical area. the population was 3,486 at the 2000 census. ==history== cornwall was founded by peter grubb in 1737. peter, a chester county stonemason, came to lancaster county around 1734 in search of building materials. first building his house and then a store, he discovered very high quality magnetite iron ore nearby and decided to mine for it, acquiring  by 1737 and over  by 1739 when mining was initiated. he called it the cornwall iron mines after his father's birthplace in cornwall, england. the cornwall 
1737_establishments_in_the_Thirteen_Colonies Boroughs_in_Lebanon_County,_Pennsylvania Boroughs_in_Pennsylvania Populated_places_established_in_1737