Fairfax is a town in southeastern Gregory County, South Dakota, United States.

[9] According to the United States Census Bureau, the town has a total area of 0.30 square miles (0.78 km2), all land.

44.4% of all households were made up of individuals, and 22.2% had someone living alone who was 65 years of age or older.

47.6% of all households were made up of individuals, and 31.7% had someone living alone who was 65 years of age or older.

There were no families and 4.8% of the population living below the poverty line, including no under eighteens and 10.3% of those over 64.

Media related to Fairfax, South Dakota at Wikimedia Commons