Hartford is a city in Warren County, Iowa, United States.

[5] According to the United States Census Bureau, the city has a total area of 1.03 square miles (2.67 km2), all of it land.

There were 294 housing units at an average density of 270.3 per square mile (104.4/km2).

Hispanic or Latino persons of any race comprised 3.3% of the population.

As of the census[9] of 2010, there were 771 people, 279 households, and 208 families residing in the city.

There were 299 housing units at an average density of 290.3 per square mile (112.1/km2).

20.8% of all households were made up of individuals, and 9% had someone living alone who was 65 years of age or older.

There were 282 housing units at an average density of 289.4 per square mile (111.7/km2).

20.3% of all households were made up of individuals, and 7.7% had someone living alone who was 65 years of age or older.