Regional Codes ...
For statistical purposes, the US Census Bureau has divided the country into four Regions. Oak Grove is located in Region #3 (the South Region).
In turn, the US Census Bureau has further divided each Region into Divisions. Oak Grove is located in Division #6 (the East South-Central Division).
The Office of Management and Budget (OMB) has created ten Federal Regions. Oak Grove is located in Region IV (Region 4).
Referenced GNIS Records ...
GNIS ID #156816 (Name of Record: Oak Grove)
Class: populated place
A place or area having clustered or scattered buildings and a permanent population (such as a city, settlement, town or village). The boundaries may or may not coincide with the perceived population.
A 'populated place' record may have a corresponding 'census' or 'civil' record. The information contained in the 'populated place' record applies only to the class and should not be confused with either the 'census' and 'civil' classes.
Map Name: Ider
Lat: 34.6573046 Lon: -85.6294116 [Map]
Referenced FIPS Records ...
FIPS Code: 01/55645 (Place Name: Oak Grove)
County: DeKalb (FIPS State/County: 01/049)
Identifies a populated place (ie- Oak Grove) that is wholly or substantially located outside the boundaries of any incorporated place or CDP (Census Designated Place) that has an authoritative common name recognized by the U.S. Geological Survey (USGS).