Why don't you just add the word "County" after the content control?
To answer your question. Yes. Assuming the CC titled "County" add the following to the ThisDocument module of your template project:
Code:
Private Sub Document_ContentControlOnExit(ByVal CC As ContentControl, Cancel As Boolean)
Select Case CC.Title
Case "County"
If Not CC.ShowingPlaceholderText Then CC.Range.Text = CC.Range.Text & " County"
End Select
End Sub