Oxbow is a city in Cass County, North Dakota, United States. The population was 381 at the 2020 census. It is an upscale bedroom co…Oxbow is a city in Cass County, North Dakota, United States. The population was 381 at the 2020 census. It is an upscale bedroom community located 15 miles south of Fargo. It was incorporated as a city October 25, 1988.