off the top of my head? there are a few of them, but I can only recall these.
I'll edit this when I think of more. I swear there is more than what I can remember.
Manga
Cuprum's Bride (promoting Niigata's Tsubame-Sanjo. An artisan town. Goes into great detail on how artisians in that town makes certain stuff and local areas.)
Dosanko Gyaru wa Namaramenkoi (various information on Hokkaido's more rural areas and tourism spots.)
Locodol (the girls use their talent to promote Nagarekawa in Hiroshima and their businesses)
Anime:
Sakura Quest. (basically trying to glorify rural area of Nanto, in Toyama, Which is where the animation studio is located)
Zombie Land Saga. (it's in the title, the entire anime goes out of it's way to insert ideal charm points about Saga in Kyushu. From the famous local restaurants, customs, and etc. Hell the entire anime was made to promote Saga as it's the plot of the series to bring life back to Saga.)
Love Live Sunshine. (taking place in Uchiura in Numazu city, another rural dead town, going out of their way to give it charm points)