There was a combined almost $500,000 of land and rural real estate for sale in Foster County, North Dakota, recently on Land.com. The total of all Foster County land for sale was almost 1,000 acres. Foster County ranks 26th out of 53 counties in the Sioux State for the combined amount of land currently advertised for sale. Of all farms and ranches for sale in Foster County, Carrington had the most land for sale. Its economy is defined as agricultural, with 310 farms recorded in the county during the most recent U.S. Census. Farming activities in Foster County generate annual revenues of $6 million, most of which is from crops. Foster County is the 52nd largest county (646 square miles) in North Dakota. It's located in the Southeast North Dakota region of North Dakota.