Regional Codes ...
For statistical purposes, the US Census Bureau has divided the country into four Regions. River Ridge would have been located in Region #3 (the South Region).
In turn, the US Census Bureau has further divided each Region into Divisions. River Ridge would have been located in Division #6 (the East South-Central Division).
The Office of Management and Budget (OMB) has created ten Federal Regions. River Ridge would have been located in Region IV (Region 4).
The Federal Emergency Management Agency (FEMA) has created ten Management Regions. River Ridge would have been located in Region IV (Region 4).
Referenced GNIS Records ...
GNIS ID #156971 (Name of Record: River Ridge)
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: Natchez
Lat: 31.7137668 Lon: -87.3130436 [Map]
Elev: 33 ft.
Referenced FIPS Records ...
FIPS Code: 01/64880 (Place Name: River Ridge)
County: Monroe (FIPS State/County: 01/099)
Identifies a populated place (ie- River Ridge) 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).