| But, What about .... | In 1840, it was still a part of .... | | Deer Creek Township | Sandy Creek Township | | East Lackawannock Township | Lackawannock Township | | Fairview Township | Cool Spring Township | | Findley Township | Springfield Township | | Greene Township | West Salem Township | | Hempfield Township | Salem Twp. and West Salem Twp. | | Jackson Township | Cool Spring Township | | Jefferson Township | Delaware Township | | Lake Township | Cool Spring Township | | Liberty Township | Wolf Creek Township | | Mill Creek Township | French Creek Township | | New Vernon Township | Sandy Creek Township | | Otter Creek Township | Salem Township | | Perry Township | Sandy Creek Township | | Pine Township | Wolf Creek Township | | South Pymatuning Township | Pymatuning Township | | Sugar Grove Township | Salem Twp. and West Salem Twp. | | Wilmington Township | Lackawannock Township | | Worth Township | Sandy Lake Township | | Mahoning, Slippery Rock, and Neshannock Townships (as well as part of
Shenango and Lackawannock Townships) and the Borough of New Castle
became part of Lawrence County. |
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| The 1840 census transcriptions for Mercer County, PA, were
contributed by John MacDonald. He has graciously made these freely
available to all Mercer County researchers. However, he still retains
all rights to these compilations and strictly forbids any commercial
use of his work. |
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