The value of land for sale in Foster County recently on Land.com was $500,000. This represents nearly 1,000 acres of ranches, farms, hunting land and other rural land and acreage for sale in Foster County. Foster County ranks 25th in North Dakota for the combined amount of land currently advertised for sale. Carrington featured 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 North Dakota's 52nd biggest county (646 square miles). It's located in the Southeast North Dakota region of North Dakota.