Grannis is a city in Polk County, Arkansas, United States.

[3] According to the United States Census Bureau, the city has a total area of 8.6 square miles (22 km2), all land.

As of the 2020 United States census, there were 496 people, 259 households, and 184 families residing in the city.

As of the census[6] of 2000, there were 575 people, 210 households, and 164 families residing in the city.

18.1% of all households were made up of individuals, and 4.8% had someone living alone who was 65 years of age or older.