Richland County, North Dakota

Richland County is a county in the far southeast corner of the U.S. state of North Dakota. As of the 2020 census, the population was 16,529, and was estimated to be 16,731 in 2025. The county seat and the largest city is Wahpeton.

Richland County is part of the Wahpeton, ND–MNMicropolitan Statistical Area, which is also included in the Fargo-Wahpeton, ND-MN Combined Statistical Area.