Title: Duncan, British Columbia
Content:  Duncan (pop. 4,944) is a city on southern Vancouver Island in British Columbia, Canada. It is the smallest city by area (2.07 square kilometres, 0.8 square miles) in Canada.
Title: Duncan, Oklahoma
Content:  Duncan is located at 34.50222°N, -97.95778°W (34.5023029, -97.9578129). The town is situated approximately 30 miles east of Lawton and 80 mi south of Oklahoma City. According to the United States Census Bureau, the city has a total area of 46.0 sqmi, of which 38.8 sqmi is land and 7.2 sqmi (15.67%) is water. Duncan is known for crape myrtle trees, Oklahoma prairie and rich farmland. State lawmakers designated the city as Oklahoma's official "Crape Myrtle Capital". Oklahoma's grasslands are made up of shortgrass, mixed-grass and tallgrass prairie. The city is part of the Great Plains and has four lakes. Duncan receives 34 inches of rain per year, but only five inches of snowfall. The city also receives an average of 241 sunny days per year. It lies 1,128 feet above sea level. The downtown area lies between Walnut and Willow avenues, from the railroad tracks to Highway 81.
Title: Duncan Airport
Content:  Duncan Airport is located adjacent to Duncan, British Columbia, Canada.
Title: Duncan Village
Content:   Duncan Village is a township in the Buffalo City Metropolitan Municipality in the Eastern Cape province of South Africa. The township is located about five kilometres away from the East London city business district (CBD). Duncan Village is divided into six wards, with each headed by a ward councillor. There are no clear divisions between the informal and formal parts of the township since most shacks are planted on the open spaces within formal houses.
Title: Duncan, British Columbia
Content:  The city is about 45 kilometres from both Victoria to the south and Nanaimo to the north. Although the City of Duncan has a population of just under 5,000, it serves the Cowichan Valley which has a population of approximately 84,000, many of whom live in North Cowichan and Cowichan Tribes. This gives Duncan a much larger perceived "greater" population than that contained within the city limits. People in areas of North Cowichan and bordering on Duncan usually use "Duncan" as their mailing address. Duncan has one seat on the Cowichan Valley Regional District Board. The name Cowichan is an Anglicization of Halkomelem Quw̓utsun̓, which means "the warm land".
Title: Duncan, British Columbia
Content:  According to the Köppen climate classification, Duncan has a warm-summer Mediterranean climate (Köppen Csb).
Title: Duncan, South Carolina
Content:  Duncan is a town in Spartanburg County, South Carolina, United States. Its population was 3,181 at the 2010 census.
Title: Duncan, North Carolina
Content:  Duncan is an unincorporated community located in the Buckhorn Township of Harnett County, North Carolina. It is a part of the Dunn Micropolitan Area, which is also a part of the greater Raleigh–Durham–Cary Combined Statistical Area (CSA) as defined by the United States Census Bureau. Duncan was used as major source of inspiration for the fictional town of Missing Mile, North Carolina in Poppy Z. Brite's novel Drawing Blood. Duncan was formerly Casma at least into the 1930s. As the rail road activity expanded along the Duncan Depot Station, the community became known as Duncan. Avents Creek and Parkers Creek, both tributaries to the Cape Fear River, rise in ponds near Duncan.
Title: Duncan, Oklahoma
Content:  At the 2010 census, there were 23,431 people and 9,535 households residing in the city. There were 11,064 housing units. The racial makeup of the city was 82.3% White, 3.3% African American, 4.7% Native American, and 5.0% from two or more races. Hispanic or Latino of any race were 8.9% of the population. The average household size was 2.41. The age distribution was 23.8% under the age of 18 and 17.9% 65 or older. The median household income was $39,683. The per capita income for the city was $22,230. About 16% of the population were below the poverty line.
Title: Duncan, Mississippi
Content:  Duncan is named for an early "leading citizen."

Question: What is Duncan the capital of?
Answer: Stephens County.
Stephens County, Oklahoma.