Learn About
The Commemorative
Quarter for
The Commemorative Quarter for Missouri

The 2000 Census showed that Johnson County had a population of 48,258 people. This represented 0.86% of the total population of Missouri, making it the state's 18th most populous county (out of 115 counties).

From the Census Estimates for 2009<1>, Johnson had a population of 52,657 people. This is an increase of 9.12% 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
201052,595+8.99%-0.12% since 2009
200952,657+9.12%+0.95% since 2008
200852,161+8.09%+0.29% since 2007
200752,009+7.77%+0.62% since 2006
200651,687+7.11%+0.42% since 2005
200551,473+6.66%+0.51% since 2004
200451,212+6.12%+1.33% since 2003
200350,538+4.72%+1.31% since 2002
200249,884+3.37%+1.16% since 2001
200149,310+2.18%+2.18% since 2000
200048,258The Last Census

Johnson County had 18,886 Housing Units<2> at the time of the 2000 Census.

The 2000 Census shows that Johnson County has a total area<3> of 833 square miles [2,157 km²]. Of this total, only a minor amount of that area is covered by water (2.59 square miles [6.7 km²]).

Using the above population and land area values, Johnson County had a population density of 58.1 people per square mile [22.44 people/km²], making it the state's 26th most densely populated county (out of 115 counties).

US Census QuickFacts

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

Click here for the Johnson County QuickFact (QF-29101).

Below are some of the communities that are located in Johnson County:

(2009 Est)
(2000 Census)
Change in

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

(2009 Est.)
(2000 Census)
Change in
CassQF-29037   W100,18482,09222.04%
HenryQF-29083   S22,17621,9970.81%
JacksonQF-29095   NW705,708654,8807.76%
LafayetteQF-29107   N32,57232,960-1.18%
PettisQF-29159   E41,42139,4035.12%
SalineQF-29195   NE22,82123,756-3.94%

Other Roadside Stops ...

About Missouri

Find a Community located in Missouri

Off-the-Road Links ...

U.S. Census Bureau
Census QuickFact for Johnson 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 Johnson. 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