Allegheny Co., PA Books Cemeteries Census
Created: 1788 Maps Official Records Photos Population
Allegheny Co., PA
Allegheny Co., PA was formed from portions of Washington and Westmoreland Cos..
You might consider searching in those Counties for earlier records.
Population
The following table details the population of the County from the first census available up through 1940.
Information is shown for 1890, but that census was mostly lost due to a fire and mishandling in the 1920's and 1930's.
Don't forget to check on the main Pennsylvania page for links to free online versions of the census
1790 10,203 1800 15,087 1810 25,317 1820 34,921 1830 50,552 1840 81,235 1850 138,290 1860 178,831
1870 262,204 1880 355,869 1890 551,959 1900 775,058 1910 1,018,463 1920 1,185,808 1930 1,374,410 1940 1,411,539
Historical Census Browser. The University of Virginia, Geospatial and Statistical Data Center: http://mapserver.lib.virginia.edu

Helpful Links
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Books
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Cemeteries
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Census Records
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Maps
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Official Records
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Allegheny Co., PA Government Offices Contacts
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Birth, Death, Marriage and Estate Records
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Real Estate Transaction Records
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Photos
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email Updated 9/14/2015
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