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

Warren County was founded May 1, 1803 and was created by taking area from HamiltonCounty.

From the Census Estimates for 2009, <1> Warren had a population of 210,712 people. This is an increase of 33.04% since the last Census (which gave a population of 158,383 people in 2000).

At the time of the 2000 Census, Warren represented 1.4% of the total population of Ohio, making it the state's 14th most populous county (out of 88 counties).

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

YearPopulationChange
Since 2000
Year-to-Year Change
2010212,693+34.29%+0.94% since 2009
2009210,712+33.04%+1.58% since 2008
2008207,425+30.96%+1.66% since 2007
2007204,045+28.83% 
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2000158,383The Last Census

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

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

Community 2009
Population
2000
Population
Change
(2009vs. 2000)
Mason   29,99522,01636.24% increase  
Lebanon   20,75616,96222.37% increase  
Franklin   13,11811,39615.11% increase  
Carlisle   6,1065,12119.23% increase  
South Lebanon   3,7302,53846.97% increase  

Websites for Warren County

Official Website:   www.co.warren.oh.us/

If you know of a history or genealogy society whose interest includes Warren 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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