Thanks for taking the time to put this together for us, kellym. There are so many members here who will find it quite useful.
I have a correction, though. Pennsylvania actually goes by the municipality, not the county. If the municipality does not have it's own health department or regulations regarding cottage law, then the state steps in.
PA does allow for cottage law rules, but they are most easily applied in suburban and rural areas. For instance, in Philadelphia, Allentown, and Pittsburgh, those cities do not allow for home kitchens to be used for commercial purposes. But right outside of them, businesses are popping up all over. We have a few members here who are working out of their home kitchens, right outside these cities. If zoned high-density residential, like my home is, you can't even build a separate kitchen on your property to bake from. And where I live, at least one person in the employ of the business has to be ServSafe certified. Many smaller municipalities do not require this.
Every town around me allows for cottage law rules, with some exceptions. For instance, some municipalities will allow you to run your business from your home kitchen, others will still require you to build a separate kitchen on your property. And wouldn't you know it, we just couldn't get the mortgage to buy the 5-bedroom property we looked at, where they would have allowed me to build another kitchen on the second floor for home purposes, then use the first floor to run my business.