ALLEGHENY COUNTY, PENNSYLVANIA

COUNTY SEAT:  Pittsburgh            YEAR FOUNDED:  1788

 

Land Area

 730 square miles

 

2000 Population

1,281,666 persons

Water Area

  15 square miles

 

 

 

County Area

  745 square miles

 

Population Density

 1,720 persons per square mile

 

 

 

 

 

Allegheny County contains a total land area of 745 square miles and according to the 2000 census contained a population of 1,281,666 persons.  This is a net decrease of 54,189 persons (4.06%) from the 1990 census of 1,335,855 persons.  The United States Census Bureau estimates the population of Allegheny County in 2004 to be 1,250,867, which continues the previous decade’s trend.