Check this great new web resource, a service of the National Institute for Literacy and partners, called America's Literacy Directory. You can enter your zip code as well as what kind of help you are looking for and how far away from your home you are able to travel to a program.
The International Literacy Explorer website includes a section, "Statistics on Literacy." This section has two goals: (1) to serve as a training and learning tool and (2) to show statistical data about literacy levels and related factors.