Just my 2 cents on this. I have been trying to work on this puzzle myself. Looking at maps and trying different combinations of letters, etc. I am now wondering if maybe this is a postal configuration of an abbreviation...SAG, IAG, LAG, etc and the number "One" as in a route #. ...a former resident (age 5 - age 8 /1965-1968/ Tioga School, Green Street School, Oak Street School) of DuPage Co. And BTW does anyone know where the school records finally end up for DuPage County schools? Trying to track mine down - and not just the permanent report card but all of my school records (particularly attendance records) if they still exist that is. Any help will be appreciated. Thanks Barry Jernigan