Dallas is an unincorporated community in Polk County, Arkansas, United States. The community is approximately three miles south of Mena. Pioneers arrived in Polk County around 1830, mainly from Tennessee, Illinois and Kentucky. They settled near Dallas, surviving off the area's abundant wild game, and building shelters from its rich timber resour…Dallas is an unincorporated community in Polk County, Arkansas, United States. The community is approximately three miles south of Mena. Pioneers arrived in Polk County around 1830, mainly from Tennessee, Illinois and Kentucky. They settled near Dallas, surviving off the area's abundant wild game, and building shelters from its rich timber resources.