Beaver County, Pennsylvania Genealogy

United States &gt; Pennsylvania &gt; Beaver County

Parent County
Cumberland, Bedford, Westmoreland, Washington, Northumberland, Allegheny

Boundary Changes

 * Southern 1/3 of Beaver was disputed between Virginia and Pennsylvania until Mason-Dixon Line was finalized in 1780; northern 2/3 was not included in any county until 1785
 * 1750: Southern 1/3 was incorporated into Cumberland Co. when Cumberland was formed
 * 1771: Southern 1/3 became part of Bedford Co. when Bedford was erected in 1771
 * 1773: Southern 1/3 became part of Westmoreland Co. when Westmoreland was formed in 1773
 * 1781: Southern 1/3 became part of Washington Co. when Washington was formed in 1781
 * 1783: Northern 2/3 was designated as Depreciation Lands for Revolutionary War soldiers
 * 1785: Northern 2/3 was annexed to Northumberland Co.
 * 1788: Nearly all of Beaver fell into Allegheny Co. when Allegheny was created in 1788; a small southern portion remained in Washington Co.
 * 1800: Beaver County was created (it then included part of today's Lawrence Co.)
 * 1849: Lawrence Co. was created, giving Beaver Co. its current boundaries

Web Sites

 * USGenWeb project. May have maps, name indexes, history or other information for this county. Select the state, then the county.
 * Family History Library Catalog