Hartshorne is a city in Pittsburg County, Oklahoma, United States. It is the second largest city in the county. The population was 1,947 at the time of the 2020 United States census.

Pittsburg County is a county located in the U.S. state of Oklahoma. As of the 2020 census, the population was 43,773. Its county seat is McAlester. The county was formed from part of the Choctaw Nation in Indian Territory in 1907. County leaders believed that its coal production compared favorably with Pittsburgh, Pennsylvania at the time of statehood.