Fill Column Based On Another Column

I need to fill in one column (a county code) based off of the contents of another column (the State). Something that would generally be easily solved through a VLookup. However I want the macro I write to be usable in other workbooks where the columns may not appear in the same order or with the same spacing (slightly different names may be possible too but we'll look over this for now). I have the columns named by their heading, but then I need the macro to go down the two rows, filling in 998 in the county code column, if the state is not OH.


Dim x As Integer
Dim STcode As Range
Dim CnTcode As Range

For x = 0 To ActiveSheet.UsedRange.Rows.Count
If STcode.Cells(x, "State").Value <> "OH" Then
CnTcode.Cells(x, "County_Code").Value = "998"
End If
Next x

I know that there is a problem in the logic because "State" and "County Code" are ranges, so excel doesn't like me referencing them as columns.