Janesville, WI Profile: Facts, Map & Data


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Janesville, Wisconsin - Basic Facts

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The City of Janesville is the 10th largest city in Wisconsin with a population of 64,332 as of July 1, 2017. Janesville ranks in the upper quartile for Population Density and Diversity Index when compared to the other cities, towns and Census Designated Places (CDPs) in Wisconsin. See peer rankings below.

The primary coordinate point for Janesville is located at latitude 42.6847 and longitude -89.0132 in Rock County. The formal boundaries for the City of Janesville (see map below) encompass a land area of 33.75 sq. miles and a water area of 0.6 sq. miles. Rock County is in the Central time zone (GMT -6). The elevation is 837 feet.

The City of Janesville (GNIS ID: 1583448) has a C5 Census Class Code which indicates an active incorporated place that is independent of any county subdivision and serves as a county subdivision equivalent. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.

Beneath the boundary map are tables with Janesville population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2017.

Alternate Unofficial Names for Janesville: Black Hawk, E-nee-poro-poro.

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City of Janesville, WI Boundary Map

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Janesville, WI Data & Demographics (As of July 1, 2017)


Total Population 64,332
Daytime Population: Workers 36,127
Daytime Population: Residents 31,749
Total Daytime Population (TDP) 67,876
Ratio TDP/Total Population1 1.06
Population in Households 63,706
Population in Familes 49,735
Population in Group Qrtrs 626
Population Density2 1,906
Diversity Index3 28


Median Household Income $51,987
Average Household Income $64,782
Per Capita Income $26,985


Total Housing Units 28,294 (100%)
Owner Occupied HU 17,113 (60.5%)
Renter Occupied HU 9,264 (32.7%)
Vacant Housing Units 1,917 ( 6.8%)
Median Home Value $136,988
Average Home Value $159,113


Total Households 26,377
Average Household Size 2.42
Family Households 16,943
Average Family Size 3
  1. If the ratio of the TDP to Total Population is greater than 1, the location gains population during the day when commuting workers are present. If the ratio is less than 1, the location is more of a bedroom community where people commute to another place for work.
  2. Population Density = Total Population per square mile.
  3. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.


2010-2017 2017-2022
Population 0.18% 0.26%
Households 0.3% 0.32%
Families 0.2% 0.24%
Median Household Income   2.14%
Per Capita Income   2.79%

Janesville, WI - Peer Comparisons by Rank and Percentile

The table below compares Janesville to the other 774 incorporated cities, towns and CDPs in Wisconsin by rank and percentile using July 1, 2017 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 10 99th
Population Density # 76 90th
Diversity Index # 127 84th
Median Household Income # 439 43rd
Per Capita Income # 396 49th

Additional comparisons and rankings can be made with a VERY EASY TO USE Wisconsin Census Data Comparison Tool.

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