Killdeer (Hidatsa: Cíìdadagi Arudíheesh, "happy land") is a city in Dunn County, North Dakota, United States.

[3] Killdeer was founded in 1914 at the end of a Northern Pacific Railway branch line that began in Mandan.

[5][6] According to the United States Census Bureau, the city has a total area of 0.94 square miles (2.43 km2), all land.

33.2% of all households were made up of individuals, and 14.2% had someone living alone who was 65 years of age or older.

The racial makeup of the city was 93.97% White, 4.91% Native American, 0.14% Asian, and 0.98% from two or more races.

36.4% of all households were made up of individuals, and 22.6% had someone living alone who was 65 years of age or older.

[9] This climatic region is typified by large seasonal temperature differences, with warm to hot (and often humid) summers and cold (sometimes severely cold) winters.