Wasco is a city in Sherman County, Oregon, United States.

According to the United States Census Bureau, the city has a total area of 1.00 square mile (2.59 km2), all land.

[6] This region experiences warm (but not hot) and dry summers, with no average monthly temperatures above 71.6 °F.

There were 208 housing units at an average density of 208.0 per square mile (80.3/km2).

31.3% of all households were made up of individuals, and 13.1% had someone living alone who was 65 years of age or older.

29.8% of all households were made up of individuals, and 16.1% had someone living alone who was 65 years of age or older.