There are two reasons for programming multiple county codes, not all apply to you of course.
I used to live near 7 Mile and Telegraph in Detroit, that is Wayne County, Michigan (I no longer live there folks) but it is only ONE MILE (Plus 1.5 blocks) from Oakland County and not all that far from Washtenaw County. So that's 3 counties I might wish to program. (And did)
As an RVer I normally park in one of 3 counties, Currently in one, Next week this time I'll be in another (And not far from a third) and in the winter I park in mostly one county, (Sometimes another) and 3 miles from another state.
So that's 4 more counties to program. Of course I won't get "Michigan" county alerts when I'm in South Carolina,, or SC in MI.
Finally,,, as a Ham Radio operator I am sometimes a "Responder" (generally not first but later) when storms hit.. Thus I may well want all the counties around me cause that way I know where I'll be needed.. Not so much since I do not have a car just now, but I hope to fix that in a few months.
