Marsing is a city in Owyhee County, Idaho, United States.

Marsing is on the Snake River, which forms the border with Canyon County.

[4] State Highway 55 connects the city with Canyon County and continues to Nampa to the northeast.

Two miles (3 km) west of Marsing, Highway 55 connects with U.S. Route 95, the primary north–south route for the state and its primary connection to western Nevada and northern California.

State Highway 78 heads southeast to Murphy and Grand View within Owyhee County.

24.8% of all households were made up of individuals, and 10.5% had someone living alone who was 65 years of age or older.

24.4% of all households were made up of individuals, and 12.0% had someone living alone who was 65 years of age or older.