Carter County is located in the southeastern part of Montana, bordered by South Dakota to the east. It was established in 1917 and is named after Samuel Carter, a local rancher. The county seat is Ekalaka, which serves as the primary hub for government and services in the area. The county is known for its vast landscapes, including rolling hills and grasslands, making it ideal for agriculture and ranching. Carter County is also home to several parks and recreational areas, offering opportunities for outdoor activities such as hiking and wildlife viewing.