McCook is a city in and the county seat of Red Willow County, Nebraska, United States. The population was 7,698 at the 2010 census.
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McCook was platted in 1882 when the Burlington and Missouri River Railroad was extended to that point. It was named in honor of Alexander McDowell McCook, a Brigadier General in the Union Army during the American Civil War.
McCook is located at 40°12′19″N 100°37′34″W (40.205228, −100.626174). According to the United States Census Bureau, the city has a total area of 5.39 square miles (13.96 km2), all land.