Total Population Counts and Historical Datasets

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The US Census Bureau’s Decennial Census program collects complete counts of US population every 10 years.


1960 1970 1980 1990 2000 2010
Delaware County Population 553,154 603,456 555,007 547,651 550,864 558,979

Change in population 2000-2010 map

For more information regarding historic population data, please contact us at 610-891-5200 or Planning_Department@co.delaware.pa.us.



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About Delaware County

Delaware County, presently consisting of over 184 square miles divided into forty-nine municipalities is the oldest settled section of Pennsylvania.


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