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Summary for Oak Grove

About Oak Grove (Click for our profile page)

Located in: Cass County (see below)

Typical Abbreviation: Oak Grv.

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

Telephone Area Codes: 217 & 447<1>

Elevation: 440 feet [134.11 m] above sea level<2>

GPS Coordinates (Latitude/Longitude)<3>

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

Lat: 40.019500° (or 40°1'10" N)

Lon: -90.414600° (or -90°24'52" W)

USGS Topo Map: Beardstown<4>

Federal GNIS/FIPS Codes for Oak Grove

GNIS ID: 1866580

FIPS State / Place Code: None

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

About Cass County

The community of Virginia is the County Seat for Cass County.

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

Population

Year	Population
2019 Est:<5>	12,147 (10.9% decrease since 2010)
2010	13,633 (0.45% decrease since 2000)
2000:	13,695

Total Area:<6> 383.8 sq. miles [993.9 km²] - of which 2.07% is water (7.95 sq. miles [20.6 km²])

Housing Units: <7> 5,836

Official Website: https://co.cass.il.us/

Federal GNIS/FIPS Codes for Cass

GNIS ID: 424210

FIPS State / County Code: 17 / 017

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

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://www.illinois.gov/

Tourism: https://www.enjoyillinois.com/

Parks: https://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 Oak Grove)

Footnotes ...

<1>	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 217 code has been Overlayed with the 447 area code. New phone numbers in the Oak Grove area will be assigned with one of these codes: 217 or 447. As a result, placing a call in the Oak Grove area will require 10-digit dialing (where you enter both the area code and then the phone number).
<2>	The elevation is an estimate for the area around Oak Grove - it will be higher in some places and lower in others.
<3>	Longitude & latitude values may not be the geographic center of Oak Grove, rather it may be a prominent intersection or the center of population, etc. It will vary depending on the source.
<4>	Name of the USGS 7.5 Minute topographic map which includes Oak Grove.
<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 Oak Grove. 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).