Sumpter is a city in Baker County, Oregon, United States. The population was 204 at the 2010 census. Sumpter is named after Fort Sumter by its founders. The name was inspired by a rock as smooth and round as a cannonball, which reminded a local resident of the American Civil War and Fort Sumter.
Sumpter, about 4,400 feet (1,300 m) above sea level, is near the Wallowa–Whitman National Forest, the Blue Mountains, and a subrange of the Blue Mountains, the Elkhorn Mountains. McCully Fork and Cracker Creek meet to form the Powder River near Sumpter. According to the United States Census Bureau, the city has a total area of 2.18 square miles (5.65 km), all land.
Sumpter is along Oregon Route 410, also known as the Sumpter Highway. By highway, the city is 26 miles (42 km) from Baker City, 31 miles (50 km) from Interstate 84, and 333 miles (536 km) from Portland. A 106-mile (171 km) loop drive known as the Elkhorn Scenic Byway passes through Sumpter, connecting to Oregon Route 7 at its intersection with Route 410.
As of the census of 2010, there were 204 people, 119 households, and 65 families residing in the city. The population density was about 94 inhabitants per square mile (36/km). There were 307 housing units at an average density of about 141 per square mile (54/km). The racial makeup of the city was about 92% White, 2.5% Native American, 0.5% Asian, and 5% from two or more races. Hispanic or Latino of any race were 1% of the population.
There were 119 households of which about 7% had children under the age of 18 living with them; 51% were married couples living together; 2.5% had a female householder with no husband present; less than 1% had a male householder with no wife present, and 45% were non-families. About 40% of all households were made up of individuals, and 19% had someone living alone who was 65 years of age or older. The average household size was 1.71 and the average family size was 2.22.
The median age in the city was about 62 years. About 6% of residents were under the age of 18; 3% were between the ages of 18 and 24; 8% were from 25 to 44; 49% were from 45 to 64, and 34% were 65 years of age or older. The gender makeup of the city was 54% male and 46% female.