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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.
Cavalier County, North Dakota 2017 Population Estimate â 3,781 The North Dakota Census Office projects the Cavalier County 2015 population as 3,822 people and the 2020 population as 3,720. If we assume that the population changes linearly between 2015 and 2020, then the Cavalier County 2017 population would be 3,781. Note: this value is a projection, not a count. The 2010 Decennial Census provides the most recent count of the Cavalier County population as 3,993 people.