I thought I had created a blog post about this issue already, but was not able to find any information when I desperately needed to find the port number used to access the admin console of my local WAS installation. Anyhow, the trick is the file serverindex.xml
You will find the file in the directory located at
<AppServerRoot>\profiles\AppSrv01\config\cells\<cellname>\nodes\<nodename>\
So I found my console at http://localhost:9060/ibm/console/
See the InfoCenter for more information