The Third Branch — the blog of the Federal Courts, has published some statistics on where their self-represented bankruptcy filings are occurring.
Here is the key table:
The filings are heavily distributed towards the West:

It is an astonishing range, from 27% in the Central District of CA, to under 2% in some states. It makes me think that the differnce is explained more by bar and court cultures than by economic differences.
Moreover, the self-represented percentage is up very significantly overall:
[W]hile non-pro se bankruptcy petitions increased 98 percent over the last fi ve years, pro se bankruptcy petitions grew 187 percent over the same time frame.
