If you're an alumnus whose college is now defunct you are at a disadvantage in getting transcripts, connecting with other alumni, validating credentials, etc. - Here is a list as well as information about Closed Colleges and Alumni organizations.
It is an easy enough matter to download a list of US Colleges from www.ed.gov.
It gets a bit tricky to analyze the data - Here I've distilled the information to only include Closed Colleges.
Transcripts
Procedure to procure transcripts.
Financial Aid.
What to do if you are saddled with a financial aid bill - from a non-existant school.
Transfering Credits.
How to get your credits validated and hopefully, transfered intoto.
Closed Colleges
Alumni/Organizations
Database of Closed Coleges
A listing of websites, organizations, and alumni groups for various closed colleges. Hopefully, you'll find yours there - If not, start one up and be sure to let me know so I can link to it.