Jobs at small Chicago companies nobody posts about (update)

Two small Chicago employers told me they are hiring but have not posted yet. One is a print shop, one is an accounting firm and one is a clinic. Should I visit in person?

Keep everything in writing and save the confirmation numbers. It made the follow-up calls so much easier.

Thanks for writing this out. I went through something close to it last year, and it settled down once I kept a simple log of every call and form.