Changlang is a district in Arunachal Pradesh, India. The district headquarters are located at Changlang. The district occupies an area of 3,227 square kilometers. According to the 2011 census Changlang district has a population of 145,853, roughly equal to the nation of Saint Lucia. This gives it a ranking of 601st in India (out of a total of 640). The district has a population density of 45 inhabitants per square kilometer (120/sq mi). Its population growth rate over the decade 2001-2011 was 27.45%. Changlang has a sex ratio of 948 females for every 1000 males, and a literacy rate of 66.58%.