Summary for Joliet
About Joliet (Click for our profile page)
Located in: Primarily Will County (see below). A portion of Joliet extends into Kendall County.
Pronunciation: JOH-lee-et <1>
Time Zone: Joliet lies in the Central Time Zone (CST/CDT)
Telephone Area Codes: 815 & 779<2>
ZIP Codes: 60431-60436<3>
Elevation: 640 feet [195.07 m] above sea level<4>
From the 2010 US Census (For more detail, see our Census Page for Joliet)
Population
| Year | Population |
| 2019 Est:<5> | 147,214 (0.15% decrease since 2010) |
| 2010: | 147,433 (38.8% increase since 2000) |
| 2000: | 106,221 |
Total Area:<6> 62.8 sq. miles [162.6 km²] - of which 1.05% is water (0.66 sq. miles [1.7 km²])
Housing Units:<7> 51,285
Websites for Joliet
Official Website: www.ci.joliet.il.us/
Chamber of Commerce: www.jolietchamber.com/
GPS Coordinates (Latitude/Longitude)<8>
For the purpose of mapping and calculating distances, we have chosen the following reference point for Joliet:
Lat: 41.525000° (or 41°31'29" N)
Lon: -88.083000° (or -88°4'58" W)
USGS Topo Map: Plainfield<9>
Federal GNIS/FIPS Codes for Joliet
GNIS ID: 2395477
FIPS State / Place Code: 17 / 38570
(For more about Federal Codes, see our Misc Page for Joliet)
About Will County
The city of Joliet is the County Seat for Will County.
From the 2010 US Census (For more detail, see our Census Page for Will)
Population
| Year | Population |
| 2019 Est: | 690,743 (1.76% increase since 2010) |
| 2010 | 678,824 (35.15% increase since 2000) |
| 2000: | 502,266 |
Total Area: 849 sq. miles [2,199.5 km²] - of which 1.45% is water (12.32 sq. miles [31.9 km²])
Housing Units: 237,501
Official Website: www.willcountyillinois.com/
Federal GNIS/FIPS Codes for Will
GNIS ID: 1785190
FIPS State / County Code: 17 / 197
(For more about Federal Codes, see our Misc Page for Joliet)
About Illinois
From the US Census
Population
| Year | Population |
| 2019 Est: | 12,667,017 (1.28% decrease since 2010) |
| 2010: | 12,830,632 (3.31% increase since 2000) |
| 2000: | 12,419,293 |
Websites for State of Illinois
Official Website: https://illinois.gov
Tourism: https://www.enjoyillinois.com/
Parks: https://www.dnr.illinois.gov/
Fishing: https://www.ifishillinois.org/
Hunting: https://dnr.illinois.gov/hunting.html
Federal GNIS/FIPS Codes for State of Illinois
GNIS ID: 1779784
FIPS State: 17
(For more about Federal Codes, see our Misc Page for Joliet)
Off-the-Road Links ...
The official website for Joliet: www.ci.joliet.il.us/
The official website for Will County: www.willcountyillinois.com/
The official website for State of Illinois: https://illinois.gov
Footnotes ...
| <1> | The pronunciation we've provided is our attempt to give a phonetic pronunciation for Joliet. While it might not be exactly right, hopefully it will be close. If we have it wrong or there's a better way to pronounce the name, please contact us through our Feedback Page. |
| <2> | When there's a risk of an area code running out of phone numbers, an 'Overlay Area Code' is created that has the same geographic boundaries as the existing area code. In this case, the 815 code has been Overlayed with the 779 area code. New phone numbers in the Joliet area will be assigned with one of these codes: 815 or 779. As a result, placing a call in the Joliet area will require 10-digit dialing (where you enter both the area code and then the phone number). |
| <3> | 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 Joliet). When looking for a ZIP Code, whether Joliet or elsewhere, it's always best to check the website of the United States Postal Service (USPS). Our list of ZIP Codes for Joliet includes: 60431, 60432, 60433, 60434, 60435 & 60436. |
| <4> | The elevation is an estimate for the area around Joliet - it will be higher in some places and lower in others. |
| <5> | 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. |
| <6> | The area value has been supplied by the US Census Bureau and it can be different than the geographic boundaries of Joliet. 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. |
| <7> | 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). |
| <8> | Longitude & latitude values may not be the geographic center of Joliet, rather it may be a prominent intersection or the center of population, etc. It will vary depending on the source. |
| <9> | Name of the USGS 7.5 Minute topographic map which includes Joliet. |