Dike is a city in Grundy County, Iowa, United States.

[5] According to the United States Census Bureau, the city has a total area of 1.40 square miles (3.63 km2), all land.

There were 536 housing units at an average density of 385.8 per square mile (149.0/km2).

There were 497 housing units at an average density of 355.0 per square mile (137.1/km2).

19.4% of all households were made up of individuals, and 8% had someone living alone who was 65 years of age or older.

There were 393 housing units at an average density of 301.2 per square mile (116.3/km2).

The racial makeup of the city was 99.62% White, 1.21% African American, 0.32% Asian, and 0.85% from two or more races.

24.5% of all households were made up of individuals, and 10.6% had someone living alone who was 65 years of age or older.

[11] It was established on July 1, 1996, by the merger of the Dike and New Hartford school districts.