Something like this will check a range of cells to see if the value exists. If it does, you can proceed with your code in the Else portion of the IF statement.
Dim s_row As String
s_row = 14
s_row = InputBox("ENTER ROW NUMBER FOR THE JOB YOU WERE AWARDED", "CREATE ACTIVE JOB")
If s_row = vbNullString Then Exit Sub
If IsError(Application.Match(s_row, Sheets("Sheet1").Range("A1:A20"), 0)) Then
MsgBox "You must enter a valid value that exists in Sheet1!A1:A20.", vbOKOnly, "Invalid Entry"
Else
' Do your stuff
End If
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