Fort Sumner is a small city located in De Baca County, New Mexico, United States. It has a population of approximately 1,200 residents. The city is known for its historical significance, as it was the final resting place of the infamous outlaw Billy the Kid. The Billy the Kid Museum and Grave are popular tourist attractions in Fort Sumner. The city also hosts an annual Old Fort Days celebration, featuring rodeo events, a parade, and various activities for visitors.