Beaver is a city in Amaqua Township, Boone County, Iowa, United States.

[5] According to the United States Census Bureau, the city has a total area of 0.25 square miles (0.65 km2), all land.

There were 19 housing units at an average density of 76.1 per square mile (29.4/km2).

There were 28 housing units at an average density of 112.0 per square mile (43.2/km2).

30.0% of all households were made up of individuals, and 20% had someone living alone who was 65 years of age or older.

There were 26 housing units at an average density of 101.5 per square mile (39.2/km2).

The racial makeup of the city was 94.34% White, 1.89% Native American, 1.89% Asian, and 1.89% from two or more races.

23.8% of all households were made up of individuals, and 9.5% had someone living alone who was 65 years of age or older.

There were no families and 1.8% of the population living below the poverty line, including no under eighteens and 100.0% of those over 64.