Janesville, IA Profile: Facts, Map & Data


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Janesville, Iowa - Basic Facts

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The City of Janesville had a population of 988 as of July 1, 2015.

The primary coordinate point for Janesville is located at latitude 42.6458 and longitude -92.4624 in Bremer County. The formal boundaries for the City of Janesville (see map below) encompass a land area of 1.44 sq. miles and a water area of 0.05 sq. miles. Bremer County is in the Central time zone (GMT -6). The elevation is 899 feet.

While the primary coordinates for City of Janesville are located in Bremer County, it should be noted that the formal boundaries for this community also extend into and Black Hawk County.

The City of Janesville (GNIS ID: 2395456) has a C1 Census Class Code which indicates an active incorporated place that does not serve as a county subdivision equivalent. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.

The City of Janesville is located within Township of Jackson, a minor civil division (MCD) of Bremer County.

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, 2015.

Neighborhood Data

Address Based Hyperlocal Data Input an address and get data & demographics for the pertinent census block group (CBG), a searchable map and a customized directory. The CBG is the smallest geographical unit used by the Census Bureau for reporting certain data.


City of Janesville, IA Boundary Map

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Boundary Maps: Township of Jackson | Bremer County | Iowa Counties

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Janesville, IA Data & Demographics (As of July 1, 2015)


Total Population 988
Population in Households 988
Population in Familes 820
Population in Group Qrtrs 0
Population Density1 688
Diversity Index2 7


Total Households 428
Average Household Size 2.31
Family Households 298
Average Family Size 3


Total Housing Units 424 (100%)
Owner Occupied HU 346 (81.6%)
Renter Occupied HU 81 (19.1%)
Vacant Housing Units 0
Median Home Value $193,841
Average Home Value $209,078


Median Household Income $68,716
Average Household Income $73,514
Per Capita Income $30,775
  (Compound Annual Growth Rates)


2010-2015 2015-2020
Population 1.16% 1.3%
Households 1.39% 1.41%
Families 2.48% 1.31%
Median Household Income   2.46%
Per Capita Income   2.59%
1) Population Density = Total Population per square mile.
2) The Diversity Index is a scale of 0 to 100 that represents the likelyhood 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.
Based on Census 2010 counts, the Diversity Index for the United States was 60.6 and it is expected to increase to 64.8 by July 1, 2018.


Janesville, IA - Peer Comparisons by Rank and Percentile

The table below compares Janesville to the other 1,009 incorporated cities, towns and CDPs in Iowa by rank and percentile using July 1, 2015 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 # 291 71st
Population Density1 # 508 50th
Diversity Index2 # 669 34th
Median Household Income # 103 90th
Per Capita Income # 171 83rd

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