Grand River is a city in northwest Decatur County, Iowa, United States.

[3] Grand River got its start in the year 1881, following construction of the Humeston and Shenandoah Railroad through the territory.

[5] According to the United States Census Bureau, the city has a total area of 0.21 square miles (0.54 km2), all land.

[6] As of the census of 2020,[8] there were 196 people, 93 households, and 56 families residing in the city.

There were 126 housing units at an average density of 667.0 per square mile (257.5/km2).

At the 2010 census there were 236 people in 99 households, including 58 families, in the city.

There were 128 housing units at an average density of 609.5 per square mile (235.3/km2).

There were 123 housing units at an average density of 590.3 per square mile (227.9/km2).

About 7.0% of families and 14.9% of the population were below the poverty line, including 6.7% of those under the age of eighteen and 27.0% of those sixty five or over.