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Summary for Janesville

About Janesville (Click for our profile page)

Located in: Primarily Black Hawk County (see below). A portion of Janesville extends into Bremer County.

Time Zone: Janesville lies in the Central Time Zone (CST/CDT)

Telephone Area Code: 319

ZIP Code: 50647<1>

Elevation: 910 feet [277.37 m] above sea level<2>

From the 2010 US Census (For more detail, see our Census Page for Janesville)

Population

Year	Population
2019 Est:<3>	988 (6.24% increase since 2010)
2010:	930 (12.18% increase since 2000)
2000:	829

Total Area:<4> 1.49 sq. miles [3.9 km²] - of which 3.62% is water (0.05 sq. miles [0.1 km²])

Housing Units:<5> 409

GPS Coordinates (Latitude/Longitude)<6>

For the purpose of mapping and calculating distances, we have chosen the following reference point for Janesville:

Lat: 42.647200° (or 42°38'49" N)

Lon: -92.460400° (or -92°27'37" W)

USGS Topo Map: Waverly<7>

Federal GNIS/FIPS Codes for Janesville

GNIS ID: 2395456

FIPS State / Place Code: 19 / 39405

(For more about Federal Codes, see our Misc Page for Janesville)

About Black Hawk County

The city of Waterloo is the County Seat for Black Hawk County.

From the 2010 US Census (For more detail, see our Census Page for Black Hawk)

Population

Year	Population
2019 Est:	131,228
2010	131,162 (2.46% increase since 2000)
2000:	128,012

Total Area: 572 sq. miles [1,483.2 km²] - of which 1.21% is water (6.91 sq. miles [17.9 km²])

Housing Units: 55,887

Official Website: https://www.blackhawkcounty.iowa.gov/

Federal GNIS/FIPS Codes for Black Hawk

GNIS ID: 465196

FIPS State / County Code: 19 / 013

(For more about Federal Codes, see our Misc Page for Janesville)

About Iowa

From the US Census

Population

Year	Population
2019 Est:	3,159,596 (3.72% increase since 2010)
2010:	3,046,355 (4.1% increase since 2000)
2000:	2,926,324

Websites for State of Iowa

Official Website: https://www.iowa.gov/

Tourism: https://www.traveliowa.com/

Parks: https://www.iowadnr.gov/

Fishing: https://www.iowadnr.gov/things-do/fishing

Hunting: https://www.iowadnr.gov/things-do/hunting-trapping

Federal GNIS/FIPS Codes for State of Iowa

GNIS ID: 1779785

FIPS State: 19

(For more about Federal Codes, see our Misc Page for Janesville)

Footnotes ...

<1>	ZIP Codes have been created by the United States Postal Service (USPS) as a way of grouping addresses to make delivery more efficient. The boundaries of the ZIP Code can be changed, re-assigned, eliminated or overlapped with other ZIP Codes. So keep in mind that any given ZIP Code is only 'loosely' associated with a city (such as Janesville). When looking for a ZIP Code, whether Janesville or elsewhere, it's always best to check the website of the United States Postal Service (USPS).
<2>	The elevation is an estimate for the area around Janesville - it will be higher in some places and lower in others.
<3>	Every year, the US Census Bureau creates a population estimate for the preceeding year. Keep in mind that this value is an estimate and not an actual count. The most recent Census estimate is for the year 2019.
<4>	The area value has been supplied by the US Census Bureau and it can be different than the geographic boundaries of Janesville. The value given by the Census Bureau reflects their statistical (or sampling) requirements. For example, if there is a cluster of people living just outside of the community's official boundary, the Census-defined area might be expanded to include that group.
<5>	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).
<6>	Longitude & latitude values may not be the geographic center of Janesville, rather it may be a prominent intersection or the center of population, etc. It will vary depending on the source.
<7>	Name of the USGS 7.5 Minute topographic map which includes Janesville.