Undocumented students in the US

does anyone know of any online colleges that dont ask for ssn in the us

You can leave the SSN field blank. Lots of college applicants don’t have a SSN for completely legitimate reasons. E.g. international students who are planning to attend on a student visa.

If a college didn’t ask for a SSN from any applicant, I would be worried that they are a scam and their degrees worthless. Colleges need SSNs to process applications for federal financial aid, for example.

If you are looking for a place to take a few online classes without the intention of earning college credits or a college degree, you can take a look at websites like Udemy or Coursera.