Cartwright is an unincorporated rural community and census-designated place in Bryan County, Oklahoma, United States. As of the 2010 census it had a population of 609. The post office opened April 25, 1940, and it is one of the newest communities in Bryan County. The ZIP code is 74731.It is named for Congressman Wilburn Cartwright. Cartwright was established because of the construction of Denison Dam when a community of shelters for workmen was erected.-Median household income is $27,212 in 2010-2014.-Median house value is $101,500 in 2010-2014.-The median year that a house in Cartwright was built is 1983.-Population density is 267.77 people per square mile.-The most prevalent race in Cartwright is white, which represent 78.49% of the total population.-Average temperature of Cartwright is 62.50°F.