Regional Codes ...
For statistical purposes, the US Census Bureau has divided the country into four Regions. Thermal would have been located in Region #3 (the South Region).
In turn, the US Census Bureau has further divided each Region into Divisions. Thermal would have been located in Division #6 (the East South-Central Division).
The Office of Management and Budget (OMB) has created ten Federal Regions. Thermal would have been located in Region IV (Region 4).
Referenced GNIS Records ...
GNIS ID #140337 (Name of Record: Thermal (historical))
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: Trafford
Lat: 33.8139895 Lon: -86.7258261 [Map]
Elev: 158 ft.
Referenced FIPS Records ...
FIPS Code: 01/75816 (Place Name: Thermal)
County: Jefferson (FIPS State/County: 01/073)
Identifies a populated place (in this case, Thermal) located wholly or substantially outside the boundaries of an incorporated place or CDP (Census Designated Place) but whose name has not been verified as authoritative by the U.S. Geological Survey (USGS).
MSA Code: 1000