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General Langdon Information Cavalier County where Langdon resides is 1,510.14 square miles. The resident population of this county is 4,831 and has a population rank of 2,858 out of all the places in the United States. Langdon has a total of 2,101 people and of those residents there are 981 males and 1,120 females.
Most / Least Educated Cities in MT. As of 2010-2014, the total population of Eureka is 1,036, which is 1.87% more than it was in 2000. The population growth rate is much lower than the state average rate of 11.55% and is much lower than the national average rate of 11.61%.