Sibley is a city and the county seat of Osceola County, Iowa, United States. The population was 2,860 at the time of the 2020 census. Hawkeye Point, the highest point in the State of Iowa, is also nearby.
Sibley had its start in the year 1872 by the construction of the Sioux City & St. Paul Railroad through that territory. It is the oldest town in Osceola County. Sibley is named after Henry Hastings Sibley, a prominent general during the Dakota War of 1862, who eventually became the first governor of Minnesota. William L. Harding, governor of Iowa from 1917 to 1921, was born in Sibley in 1877. The Union Pacific Worthington Subdivision passes through Sibley en route from the Minneapolis area to Sioux City. The line sees about 4 trains per day.