1840 Census
Mercer County
The following 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.
BOROUGH OF MERCERMahoning, 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.
Unsure where each township was, consult the 1840 Mercer County map.
Every Name Index to the 1840 Census
| 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 TOWNSHIP and WEST SALEM TOWNSHIP |
| 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 TOWNSHIP and WEST SALEM TOWNSHIP |
| Wilmington Township | LACKAWANNOCK TOWNSHIP |
| Worth Township | SANDY LAKE TOWNSHIP |
