Here is a link to Concho, AZ subdivision maps and subdivsion information: http://www.concholakeaz.com/subdivisions/index.htm
You can also find some history about Concho at: http://www.concholakeaz.com/concho_history.htm and on the Concho News site: http://concholakeaz.com
Hope this helps!
Here is a map, but it does not look like much of a street network: http://maps.google.com/maps?q=Concho,+AZ,+United+States+of+A
Here is thier website, with a link for History: http://www.conchoaz.com/
Have a great day.