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The Commemorative Quarter for Wisconsin

The 2000 Census showed that Rock County had a population of 152,307 people. This represented 2.84% of the total population of Wisconsin, making it the state's 8th most populous county (out of 72 counties).

From the Census Estimates for 2009<1>, Rock had a population of 160,155 people. This is an increase of 5.15% 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.

YearPopulationChange
Since 2000
Year-to-Year Change
2010160,331+5.27%+0.11% since 2009
2009160,155+5.15% 
2008160,186+5.17%+0.46% since 2007
2007159,449+4.69%+0.89% since 2006
2006158,042+3.77%+1.1% since 2005
2005156,315+2.63%+0.64% since 2004
2004155,320+1.98%+0.89% since 2003
2003153,952+1.08%+0.29% since 2002
2002153,509+0.79%+0.23% since 2001
2001153,151+0.55%+0.55% since 2000
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2000152,307The Last Census

Rock County had 62,187 Housing Units<2> at the time of the 2000 Census.

The 2000 Census shows that Rock County has a total area<3> of 726 square miles [1,880 km²]. Of this total, only a minor amount of that area is covered by water (5.73 square miles [14.84 km²]).

Using the above population and land area values, Rock County had a population density of 211.4 people per square mile [81.6 people/km²], making it the state's 13th most densely populated county (out of 72 counties).

US Census QuickFacts

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

Click here for the Rock County QuickFact (QF-55105).

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

CommunityCensus
QuickFact
Population
(2009 Est)
Population
(2000 Census)
Change in
  Population
JanesvilleQF-553782563,32559,4986.43%
BeloitQF-550650036,56035,7752.19%
BeloitQF-55065257,4637,0386.04%
MiltonQF-55522005,7445,13211.93%

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

CountyCensus
QuickFact
DirectionPopulation
(2009 Est.)
Population
(2000 Census)
Change in
Population
Boone (IL)QF-17007   SE54,02041,78629.28%
Winnebago (IL)QF-17201   S299,702278,4187.64%
DaneQF-55025   NW491,357426,52615.2%
GreenQF-55045   W36,11033,6477.32%
JeffersonQF-55055   NE80,83374,0219.2%
WalworthQF-55127   E100,59393,7597.29%

Other Roadside Stops ...

About Wisconsin

Cities, Towns and Villages of Wisconsin

Off-the-Road Links ...

U.S. Census Bureau
Census QuickFact for Rock 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 Rock. 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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