Regional Codes ...
For statistical purposes, the US Census Bureau has divided the country into four Regions. Tidewater is located in Region #3 (the South Region).
In turn, the US Census Bureau has further divided each Region into Divisions. Tidewater is located in Division #5 (the South Atlantic Division).
The Office of Management and Budget (OMB) has created ten Federal Regions. Tidewater is located in Region III (Region 3).
The Federal Emergency Management Agency (FEMA) has created ten Management Regions. Tidewater is located in Region III (Region 3).
Referenced FIPS Records ...
FIPS Code: 54/80356 (Place Name: Tidewater)
County: McDowell (FIPS State/County: 54/047)
Identifies a populated place (in this case, Tidewater) 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).