What type of license are you talking about? A master electrician license is statewide. But many counties make you buy a local business license to pull permits. Most counties around here just make you have a contractors license, master license, and a local business license. Caroline County is one example that will not accept other counties business license. County of albemarle will not accept a tradesman card, only contractor's license with designation. So you always have to be prepared when pulling permits. Permitting process can be a pain in the butt in the City of Richmond also.
Most major cities have this. Beverly hills and El Sugendo make you put a sticker in the window of your truck. If they catch you working in their town without the sticker, even if you have one, you get a fine.
It's probably in the charter when they incorporate.
A plot by the man to keep us down, and stop us from moving around.