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
1788--Allegheny County was created from Westmoreland and Washington Counties. County seat: Pittsburgh

Boundary Changes

 * Allegheny County was disputed between Virginia and Pennsylvania until the Mason-Dixon Line was finalized in 1780
 * 1750:  Southern half of Allegheny Co. was included in Cumberland Co. when Cumberland was created in 1750; northern half of Allegheny Co. was not included in iny county until 1785
 * 1771: Southern half of Allegheny Co. was included in Bedford Co. when Bedford was created out of Cumberland in 1771
 * 1773: Southern half of Allegheny Co. was included in Westmoreland Co. when Westmoreland was created out of Bedford in 1773
 * 1783: Northern half of Allegheny became part of Depreciation Lands; part of the southern half of Allegheny Co. became part of Washington Co. when Washington was created in 1781, while the rest remained part of Westmoreland Co.
 * 1785: Northern half of Allegheny was annexed to Northumberland Co.
 * 1787: Allegheny County was created, but it then contained what is now Beaver, Lawrence, Butler, Mercer, Crawford, and parts of Erie, Warren, Venango, and Armstrong
 * 1800: Allegheny Co. boundaries were finalized as it appears today

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

Neighboring Counties
Armstrong | Beaver | Butler | Washington | Westmoreland

Cemeteries
Allegheny County Cemeteries

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 (mirror site)
 * .FamilySearch.org Family History Library Catalog for Allegheny County.