I started an LLC, now my county says I can't get a business license because of where I live? What can I do?

I filed for an LLC in Virginia, and I went to my county government office to get a business license and register a fictious name (DBA) and they said I couldn't get a business license because my property is zoned agricultural. My business consists of taking mowers and equipment I already own (or am being lended in many cases) to other people's property and doing work, it's a lawn and landscaping endeavor. Also, they say because the property does not have any public road frontage, I can't apply for a special use permit. This is where I live and where I keep the equipment, there must be some feasible way I can do a legitimate business. I can't afford commercial space, I don't suppose I can use a P.O. Box, how can I get a business license?