Killdeer is a city in Dunn County, North Dakota, United States. The population was 939 at the 2020 census. Killdeer was founded in 191…Killdeer is a city in Dunn County, North Dakota, United States. The population was 939 at the 2020 census. Killdeer was founded in 1914 at the end of a Northern Pacific Railway branch line that began in Mandan. The name was taken from the nearby Killdeer Mountains.
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