Learn About
The Commemorative
Quarter for
The Commemorative Quarter for Montana

The 2000 Census showed that Lewis and Clark County had a population of 55,716 people. This represented 6.18% of the total population of Montana, making it the state's 6th most populous county (out of 56 counties).

From the Census Estimates for 2009<1>, Lewis and Clark had a population of 61,942 people. This is an increase of 11.17% 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
201063,395+13.78%+2.35% since 2009
200961,942+11.17%+1.29% since 2008
200861,156+9.76%+1.7% since 2007
200760,131+7.92%+1.83% since 2006
200659,050+5.98%+1.59% since 2005
200558,126+4.33%+0.68% since 2004
200457,731+3.62%+1.48% since 2003
200356,889+2.11%+1.33% since 2002
200256,141+0.76%-0.1% since 2001
200156,195+0.86%+0.86% since 2000
200055,716The Last Census

Lewis and Clark County had 25,672 Housing Units<2> at the time of the 2000 Census.

The 2000 Census shows that Lewis and Clark County has a total area<3> of 3,497 square miles [9,058 km²]. Of this total, 3,460 square miles [8,963 km²] of the area is land, with the balance (1.05%) being water (36.6 square miles [94.8 km²]).

Using the above population and land area values, Lewis and Clark County had a population density of 16.1 people per square mile [6.22 people/km²], making it the state's 7th 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 Lewis and Clark County is available. The QuickFact also contains a comparison between Lewis and Clark and the state of Montana.

Click here for the Lewis and Clark County QuickFact (QF-30049).

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

(2009 Est.)
(2000 Census)
Change in
BroadwaterQF-30007   SE4,7934,3859.3%
CascadeQF-30013   NE82,17880,3572.27%
FlatheadQF-30029   NW89,62474,47120.35%
JeffersonQF-30043   S11,47010,04914.14%
MeagherQF-30059   E1,9081,932-1.24%
PowellQF-30077   SW7,0897,180-1.27%
TetonQF-30099   N6,0886,445-5.54%

Other Roadside Stops ...

About Montana

Search for a Community in Montana

Off-the-Road Links ...

U.S. Census Bureau
Census QuickFact for Lewis and Clark 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.

- Return to Citation

<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).

- Return to Citation

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

- Return to Citation

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

- Return to Citation