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The Commemorative Quarter for Montana

The 2000 Census showed that Jefferson County had a population of 10,049 people. This represented 1.11% of the total population of Montana, making it the state's 19th most populous county (out of 56 counties).

From the Census Estimates for 2009<1>, Jefferson had a population of 11,470 people. This is an increase of 14.14% since the 2000 Census.

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
201011,406+13.5%-0.56% since 2009
200911,470+14.14%+1.61% since 2008
200811,288+12.33%+1.45% since 2007
200711,127+10.73%+2.38% since 2006
200610,868+8.15%+0.91% since 2005
200510,770+7.17%+1.93% since 2004
200410,566+5.14%+2.51% since 2003
200310,307+2.57%+0.82% since 2002
200210,223+1.73%+1.03% since 2001
200110,119+0.7%+0.7% since 2000
200010,049The Last Census

Jefferson County had 4,199 Housing Units<2> at the time of the 2000 Census.

The 2000 Census shows that Jefferson County has a total area<3> of 1,658 square miles [4,296 km²]. Of this total, only a minor amount of that area is covered by water (2.19 square miles [5.68 km²]).

Using the above population and land area values, Jefferson County had a population density of 6.07 people per square mile [2.34 people/km²], making it the state's 11th most densely populated county (out of 56 counties).

US Census QuickFacts

The Census Bureau has created documents containing demographic information that are called QuickFacts. A QuickFact that is specific to Jefferson County is available. The QuickFact also contains a comparison between Jefferson and the state of Montana.

Click here for the Jefferson County QuickFact (QF-30043).

Below are the counties that adjoin and form the boundaries of Jefferson County. A link to their specific Census QuickFact has been provided.

(2009 Est.)
(2000 Census)
Change in
BroadwaterQF-30007   NE4,7934,3859.3%
Deer LodgeQF-30023   W8,7929,417-6.64%
GallatinQF-30031   SE90,34367,83133.19%
Lewis and ClarkQF-30049   N61,94255,71611.17%
MadisonQF-30057   S7,4576,8518.85%
PowellQF-30077   NW7,0897,180-1.27%
Silver BowQF-30093   SW32,94934,606-4.79%

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U.S. Census Bureau
Census QuickFact for Jefferson County

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>A Housing Unit is a broad term for those places where people live (whether occupied or temporarily vacant), such as a house, an apartment, a mobile home, or an area that is considered as a separate living quarter. Separate living quarters (consisting of one or more rooms) are considered to be those places where people live, sleep and eat separately from others and that have access to the outside (either directly or by a shared hallway).

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<3>The area value has been supplied by the US Census Bureau and it can be different than the geographic boundaries of Jefferson. The value given by the Census Bureau reflects their statistical (or sampling) requirements.

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<4>All Quarter-dollar coin images from the United States Mint.

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