Petroleum County is a small county located in the state of Montana. Established in 1925, it is known for its rich natural resources, particularly oil and natural gas. The county seat is Winnett, which serves as the main hub for local government and services. The landscape of Petroleum County is characterized by rolling hills and open plains, making it a part of the larger Great Plains region. The county is sparsely populated, with a focus on agriculture and energy production as key economic activities. Outdoor recreational opportunities, such as hunting and fishing, are also popular among residents and visitors.