Marcus is a city in Cherokee County, Iowa, United States.

[5] According to the United States Census Bureau, the city has a total area of 1.54 square miles (3.99 km2), all land.

There were 540 housing units at an average density of 353.2 per square mile (136.4/km2).

There were 548 housing units at an average density of 355.8 per square mile (137.4/km2).

The racial makeup of the city was 98.0% White, 1.3% Native American, 0.1% Asian, and 0.6% from two or more races.

34.0% of all households were made up of individuals, and 20.9% had someone living alone who was 65 years of age or older.

There were 533 housing units at an average density of 308.1 per square mile (119.0/km2).

The racial makeup of the city was 98.42% White, 0.35% Native American, 0.61% Asian, and 0.61% from two or more races.

33.8% of all households were made up of individuals, and 23.3% had someone living alone who was 65 years of age or older.