Abercrombie is a small township in the Red River Valley of North Dakota. Understand The community has a population of 296 people. Get in By car Take I-29 from Fargo. Get around See Fort Abercrombie State Historic Site, 46.4453°, -96.7182°, +1 701 328-2666, histsoc@state.nd.us. 1/2 mile east of Abercrombie. Open mid-May to mid-September, Thursday-Monday, from 10AM to 5PM. This was the first United States military post in North Dakota. It was in use from 1857 to 1878. 2018-09-11 Do Buy Eat Drink Sleep Go next