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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.
Population of Sumner County. Last official estimated population of Sumner County was 24,110 (year 2014)[1]. This was 0.008% of total US population and 0.8% of total Kansas state population. Area of Sumner County is 1,185.0 miÂ² (=3069 kmÂ²), in this year population density was 20.35 p/miÂ². If population growth rate would be same as in period 2010-2014 (-0.02%/yr), Sumner County population in 2017 would be 24,094 .