Warren is a town in Bristol County, Rhode Island, United States. The population was 10,611 at the 2010 census.According to the United States Census Bureau, the town has a total area of 8.6 square miles (22 Square Kilometer), of which, 6.2 square miles (16 Square Kilometer) of it is land and 2.5 square miles (6.5 Square Kilometer) of it (28.90%) is water. Warren was the site of the Indian village of Sowams on the peninsula called Pokanoket (the near parts now called Mount Hope Neck), and was first explored by Europeans in 1621, by Edward Winslow and Stephen Hopkins. By the next year, Plymouth Colony had established a trading post at Sowams. In 1623, Winslow and John Hampden saved the life of Wampanoag Sachem Massasoit with medicine, gaining an important native ally.