There are 3 main populations of Gray Seals living in the world today. The largest is the Eastern Atlantic population, which lives along the British Isles, Iceland, and the Norwegian coast. The Western Atlantic group can be found in a territory that stretches from Newfoundland to Massachusetts. The third is the Baltic Sea population, which is the smallest because it was greatly reduced in the early 20th century. The total number of Gray Seals living in the world today is estimated to be around 300,000.