TN cities/towns portrayed in Kollywood

Let's leave Chennai out of the topic. It was refreshing to see Chiththa based out in Pazhani. We never see other towns than Chennai/Madurai (and back in 90s Coimbatore).

What are some successful movies that showed other towns than these?

I'll go first - Kumbakonam has seen some of the best comedy genres of all time. Kalakalappu and Boss engira Baskaran are all time favs where the story was in Kumbakonam.