Bradley,
I don't know how you could do this with a field. I played with a macro
today that if you put your cursor in the a blank cell in the column then it
will count a inert the number of "non-empty" fields.
Sub Test()
Dim i As Long, j As Long
Dim iCount As Long
Dim oCell As Cell
Dim oCol As Column
If Selection.Information(wdWithInTable) = True Then
i = Selection.Cells(1).RowIndex
j = Selection.Cells(1).ColumnIndex
End If
For Each oCell In Selection.Tables(1).Columns(j).Cells
If oCell.Range.Characters.Count > 1 Then
iCount = iCount + 1
End If
Next
ActiveDocument.Tables(1).Cell(i, j).Range.InsertBefore "Count = " & iCount &
" "
End Sub