Gravity is a city in Taylor County, Iowa, United States.

According to the United States Census Bureau, the city has a total area of 0.30 square miles (0.78 km2), all land.

There were 90 housing units at an average density of 267.9 per square mile (103.4/km2).

Hispanic or Latino persons of any race comprised 0.6% of the population.

There were 103 housing units at an average density of 343.3 per square mile (132.5/km2).

28.0% of all households were made up of individuals, and 9.8% had someone living alone who was 65 years of age or older.

The racial makeup of the city was 99.08% White, 0.46% Pacific Islander, 0.46% from other races.

22.4% of all households were made up of individuals, and 11.8% had someone living alone who was 65 years of age or older.

About 16.2% of families and 18.1% of the population were below the poverty line, including 11.8% of those under the age of eighteen and 5.4% of those 65 or over.