Buffalo Lake is a city in Renville County, Minnesota, United States.

[6] According to the United States Census Bureau, the city has a total area of 0.68 square miles (1.76 km2), all land.

There were 327 housing units at an average density of 480.9 per square mile (185.7/km2).

34.7% of all households were made up of individuals, and 19.5% had someone living alone who was 65 years of age or older.

There were 313 housing units at an average density of 503.3 per square mile (194.3/km2).

29.6% of all households were made up of individuals, and 18.4% had someone living alone who was 65 years of age or older.