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

The community of Watertown is the Seat for Jefferson County.

Jefferson County was founded in 1805 and was created by taking area from OneidaCounty.

From the Census Estimates for 2009, <1> Jefferson had a population of 118,719 people. This is an increase of 6.25% since the last Census (which gave a population of 111,738 people in 2000).

At the time of the 2000 Census, Jefferson represented 0.59% of the total population of New York, making it the state's 26th most populous county (out of 62 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
2010116,229+4.02%-2.1% since 2009
2009118,719+6.25%+1.33% since 2008
2008117,157+4.85%-0.68% since 2007
2000111,738The Last Census

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


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

Community 2009
(2009vs. 2000)
Watertown   27,48926,7052.94% increase  
Le Ray   21,34719,8367.62% increase  
Wilna   6,6536,2356.7% increase  
Brownville   6,2495,8436.95% increase  
Clayton   5,1584,8177.08% increase  

Websites for Jefferson County

Official Website:   www.co.jefferson.ny.us/

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