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Time Zone: Delaware County lies in the Eastern Time Zone (EST/EDT) and observes daylight saving time.

The community of Media is the Seat for Delaware County.

Delaware County was founded September 26, 1789 and was created by taking area from ChesterCounty.

From the Census Estimates for 2009, <1> Delaware had a population of 558,028 people. This is an increase of 1.3% since the last Census (which gave a population of 550,864 people in 2000).

At the time of the 2000 Census, Delaware represented 4.49% of the total population of Pennsylvania, making it the state's 5th most populous county (out of 67 counties).

The following table shows the recent changes in population. Other than 2000, the population counts have been estimated by the Census Bureau.

Since 2000
Year-to-Year Change
2010558,979+1.47%+0.17% since 2009
2009558,028+1.3%+0.32% since 2008
2008556,251+0.98%+0.22% since 2007
2000550,864The Last Census

More information can be found on the Delaware County Census Page for Delaware County.


Below are some of the communities located in Delaware County (for more communities, please visit our Nearby Page for Delaware County):

Community 2009
(2009vs. 2000)
Chester   37,10136,8540.67% increase  
Yeadon   11,43611,7622.77% decrease  
Lansdowne   10,71511,0442.98% decrease  
Darby   9,96310,2993.26% decrease  
Brookhaven   7,9837,985  

Websites for Delaware County

Official Website:   www.co.delaware.pa.us/

If you know of a history or genealogy society whose interest includes Delaware County, would you please send us the URL for their website? We would like to add their link to our Gazetteer. To contact us, please visit our Feedback Page.

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Footnotes ...

<1>On a yearly basis, the US Census Bureau creates an estimate of the county's population. Keep in mind that this is an estimate and not an actual count. The last physical count was the 2000 Census and the next count will be for the 2010 Census.

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<2>All Quarter-dollar coin images from the United States Mint.

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