Allegheny County, Pennsylvania Genealogy

United States &gt; Pennsylvania &gt; Allegheny County

County Courthouse
436 Grant St. Pittsburgh, PA 15219 Phone: (412) 350-6500 FAX:(412) 350-6512

Parent County
Allegheny County was created 24 Sepetember 1788 from Westmoreland and Washington Counties.

==== Boundary Changes ====


 * Allegheny County was disputed between Virginia and Pennsylvania until the Mason-Dixon Line was finalized in 1780.
 * 1750: Southern half of Allegheny County was included in Cumberland County when Cumberland was created in 1750; northern half of Allegheny County was not included in iny county until 1785.
 * 1771: Southern half of Allegheny County was included in Bedford County when Bedford County was created out of Cumberland County in 1771.
 * 1773: Southern half of Allegheny County was included in Westmoreland County when Westmoreland was created out of Bedford county in 1773.
 * 1783: Northern half of Allegheny became part of Depreciation Lands; part of the southern half of Allegheny County became part of Washington County when Washington County was created in 1781, while the rest remained part of Westmoreland County.
 * 1785: Northern half of Allegheny was annexed to Northumberland County.
 * 24 September 1788, Allegheny County was created from parts of Washington and Westmoreland counties.
 * 12 March 1800, Allegheny Co. boundaries were finalized as it appears today after the parts were set to form Armstrong, Beaver, Butler, Crawford, Erie, Mercer, Venango and Warren counties.

Populated Places
Pittsburgh, Forest Hills, Aleppo, Leet, Versailles, Braddock, more...

Neighboring Counties
Armstrong | Beaver | Butler | Washington | Westmoreland

Cemeteries
Allegheny County Cemeteries

Church
LDS Ward and Branch Records


 * Pittsburg
 * Wilson

Land

 * Historic Pittsburgh has posted the 1914 Warrantee Atlas of Allegheny County which shows the earliest landowners of the current county.  These  maps of each township were drawn using the earliest surveys, warrants and patents of the original owers of land within the county.

Local Histories

 * Over 950 fully-searchable books and published works covering much of western Pennsylvania have been posted online at Historic Pittsburgh, nosted by the University of Pittsburgh's Digital Library

Societies and Libraries

 * Western Pennsylvania Genealogical Society

Web Sites

 * Linkpendium - Allegheny County
 * The Allegheny County PAGenWeb Project, a member of The PAGenWeb Project, an affiliate of The USGenWeb Project.
 * The USGenWeb Archives Project for Allegheny County
 * The USGenWeb Archives Project for Allegheny County (backup site)
 * Family History Library Catalog