Ray is a city in Williams County, North Dakota, United States. The population was 740 at the 2020 census. Ray was founded in 1902. T…Ray is a city in Williams County, North Dakota, United States. The population was 740 at the 2020 census. Ray was founded in 1902. The city was named in honor of William G. Ray, a railroad official. A post office has been in operation at Ray since 1902.