High Quality Content by WIKIPEDIA articles! Valliant is a town in McCurtain County, Oklahoma, United States. The population was 771 at the 2000 census. Valliant was founded June 2, 1902, and named for Frank W. Valliant, a chief divisional engineer for the Arkansas & Choctaw Railroad being constructed in the area at that time. According to the United States Census Bureau, the town has a total area of 0.8 square miles (1.9 km²), all of it land.