Dallas is a city in, and the county seat of, Paulding County, Georgia, United States. The estimated population, as of 2020, was 14,042. Da…Dallas is a city in, and the county seat of, Paulding County, Georgia, United States. The estimated population, as of 2020, was 14,042. Dallas is a northwestern exurb of Atlanta, located approximately 38 miles from the downtown area. It was named for George M. Dallas, Vice President of the United States, under James K. Polk.