Southern California, USA. The coastline between Santa Barbara and San Diego is home to one of the densest populations of dolphins in the world. Bottlenose dolphins, Risso's dolphins, Pacific white sided dolphins and most abundantly, common dolphins can be sighted here.

While it is difficult to pin down an exact "city" due to the nomadic nature of pods, the Azores archipelago (specifically near the city of Ponta Delgada) and Monkey Mia, Australia, are frequently cited as the regions with the highest concentration of dolphins in the world. In the U.S., Sarasota, Florida, is home to the world’s longest-running study of a wild dolphin population, with a resident "community" of over 170 bottlenose dolphins that have lived in the bay for multiple generations. In 2026, Hong Kong is also famous for its rare "pink" Indo-Pacific humpback dolphins, though their numbers are dwindling. However, for sheer volume and variety, the waters surrounding the Azores host over 20 different species of cetaceans, making it the global "capital" for sightings. Dolphins are drawn to these locations by nutrient-rich currents and protected coastal bays, leading to some of the most consistent and dense "mega-pods" (sometimes numbering in the thousands) recorded by marine biologists.