Hartford is a city in Lyon County, Kansas, United States.

[8] According to the United States Census Bureau, the city has a total area of 0.38 square miles (0.98 km2), all land.

The 2020 United States census counted 355 people, 155 households, and 99 families in Hartford.

There were 185 housing units at an average density of 467.2 per square mile (180.4/km2).

30.3% of households consisted of individuals and 13.5% had someone living alone who was 65 years of age or older.

There were 193 housing units at an average density of 507.9 per square mile (196.1/km2).

33.8% of all households were made up of individuals, and 14.4% had someone living alone who was 65 years of age or older.

There were 220 housing units at an average density of 584.8 per square mile (225.8/km2).

33.5% of all households were made up of individuals, and 11.5% had someone living alone who was 65 years of age or older.

The community is served by Southern Lyon County USD 252 public school district.