Summary for Oak Brook
About Oak Brook (Click for our profile page)
Located in: Primarily DuPage County (see below). A portion of Oak Brook extends into Cook County.
Typical Abbreviation: Oak Brk.
Time Zone: Oak Brook lies in the Central Time Zone (CST/CDT)
Telephone Area Codes: (331), (630)<1>
ZIP Code: 60523<2>
Elevation: 660 feet [201.17 m] above sea level<3>
From the 2010 US Census (For more detail, see our Census Page for Oak Brook)
Population
| Year | Population |
| 2019 Est:<4> | 8,079 (2.49% increase since 2010) |
| 2010: | 7,883 (9.41% decrease since 2000) |
| 2000: | 8,702 |
Total Area:<5> 8.28 sq. miles [21.4 km²] - of which 3.97% is water (0.33 sq. miles [0.9 km²])
Housing Units:<6> 3,188
Websites for Oak Brook
Official Website: www.oak-brook.org/
Junior League: www.jlkd.org/
GPS Coordinates (Latitude/Longitude)<7>
For the purpose of mapping and calculating distances, we have chosen the following reference point for Oak Brook:
Lat: 41.837200° (or 41°50'13" N)
Lon: -87.951400° (or -87°57'5" W)
USGS Topo Map: Hinsdale<8>
Federal GNIS/FIPS Codes for Oak Brook
GNIS ID: 2399533
FIPS State / Place Code: 17 / 54534
(For more about Federal Codes, see our Misc Page for Oak Brook)
About DuPage County
The village of Wheaton is the County Seat for DuPage County.
From the 2010 US Census (For more detail, see our Census Page for DuPage)
Population
| Year | Population |
| 2019 Est: | 922,761 (0.64% increase since 2010) |
| 2010 | 916,924 (1.41% increase since 2000) |
| 2000: | 904,161 |
Total Area: 336.4 sq. miles [871.3 km²] - of which 2.65% is water (8.91 sq. miles [23.1 km²])
Housing Units: 356,179
Official Website: www.dupageco.org/
Federal GNIS/FIPS Codes for DuPage
GNIS ID: 422191
FIPS State / County Code: 17 / 043
(For more about Federal Codes, see our Misc Page for Oak Brook)
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.dnr.illinois.gov/fishing
Hunting: https://www.dnr.illinois.gov/hunting/
Federal GNIS/FIPS Codes for State of Illinois
GNIS ID: 1779784
FIPS State: 17
(For more about Federal Codes, see our Misc Page for Oak Brook)
Off-the-Road Links ...
The official website for Oak Brook: www.oak-brook.org/
The official website for DuPage County: www.dupageco.org/
The official website for State of Illinois: https://illinois.gov
Footnotes ...
| <1> | Area code (331) is an overlay for area code (630). |
| <2> | 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 village (such as Oak Brook). When looking for a ZIP Code, whether Oak Brook or elsewhere, it's always best to check the website of the United States Postal Service (USPS). |
| <3> | The elevation is an estimate for the area around Oak Brook - it will be higher in some places and lower in others. |
| <4> | 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. |
| <5> | The area value has been supplied by the US Census Bureau and it can be different than the geographic boundaries of Oak Brook. 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. |
| <6> | 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). |
| <7> | Longitude & latitude values may not be the geographic center of Oak Brook, rather it may be a prominent intersection or the center of population, etc. It will vary depending on the source. |
| <8> | Name of the USGS 7.5 Minute topographic map which includes Oak Brook. |