Garnavillo is a city in Clayton County, Iowa, United States.

[4] According to the United States Census Bureau, the city has a total area of 1.02 square miles (2.64 km2), all land.

There were 341 housing units at an average density of 361.4 per square mile (139.5/km2).

Hispanic or Latino persons of any race comprised 4.8% of the population.

There were 359 housing units at an average density of 352.0 per square mile (135.9/km2).

35.5% of all households were made up of individuals, and 22.3% had someone living alone who was 65 years of age or older.

There were 357 housing units at an average density of 406.4 per square mile (156.9/km2).

32.1% of all households were made up of individuals, and 21.7% had someone living alone who was 65 years of age or older.

The town is home to Thoma's Dairy Bar, a diner and restaurant, serving American food and homemade pies and malts.