- Delfino Airstrip: 1
 - Delfino Plaza: 19
 - Bianco Hills, Gelato Beach, Ricco Harbor, Pinna Park, Noki Bay, Sirena Beach, Pianta Village: 30
 - Corona Mountain: 10

Total of 240. Sorry, no way to find out how many are left or collected.

Source(s)

 - http://www.ign.com/faqs/2002/super-mario-sunshine-blue-coins-faq-374577