West Fargo is a city in Cass County, North Dakota, United States. It is, as of the 2020 census, the fifth most populous city in the state of North Dakota with a population of 38,626, and it is one of the state's fastest growing cities. West Fargo was founded in 1926. The city is part of the Fargo-Moorhead, ND-MN Metropolitan Statistical Area.

Cass County is a county in the U.S. state of North Dakota. As of the 2020 census, the population was 184,525. Cass County is the most populous county in North Dakota, accounting for nearly 24% of the state's population. The county seat is Fargo, the state's most populous city. The county is named for George Washington Cass, president of the Northern Pacific Railway from 1872 to 1875. It is the only Cass County in the United States that is not named after Lewis Cass.