Currently,
No, there is no main at all anywhere. I don't know if there was a Home Inspector involved prior to resale, but that was several years ago anyway. They apparently had some trust in the former owner because he was an Engineer (let us not go down that road) and did not see any immediate concerns here even after hearing what I had to say.
This was found during a Kitchen Remodel I was brought in on awhile ago. When I found out that all the kitchen outlets + Bathroom outlet + Dining Rm and some in the Living Rm, hall & outside lt were on 1 circuit I recommended some new wiring be pulled in while the walls were open. It would have been rather easy since the Panel was below and only about 15 ft away. The wiring was cloth-covered 2-wire with a separate (smaller gauge) aluminum ground wire.
To make a long story short the walls were closed back up with only a new dishwasher and microwave circuit added. And the service was not touched. After paying for the $1500.00 countertop (6' long) there just wasn't enough money left in the budget to do anything else. How can you argue with that?
Bill