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Allegheny County, PA
Population by Decades
Date
Population
Population
Change
Annual
% Change
1900
775,058
-
-
1910
1,018,463
243,405
2.8
1920
1,185,808
167,345
1.5
1930
1,374,410
188,602
1.5
1940
1,411,539
37,129
0.3
1950
1,515,237
103,698
0.7
1960
1,628,587
113,350
0.7
1970
1,605,016
-23,571
-0.1
1980
1,450,085
-154,931
-1.0
1990
1,336,449
-113,636
-0.8
2000
1,281,666
-54,783
-0.4
Source:
U.S. Bureau of Census
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