Coulter is a city in Franklin County, Iowa, United States.

[2] Coulter got its start in the 1880s, following construction of the Chicago & Great Western Railway through that territory.

[4] According to the United States Census Bureau, the city has a total area of 2.45 square miles (6.35 km2), all land.

[5] As of the census of 2020,[7] there were 219 people, 102 households, and 56 families residing in the city.

There were 113 housing units at an average density of 45.8 per square mile (17.7/km2).

Hispanic or Latino persons of any race comprised 24.2% of the population.

There were 117 housing units at an average density of 47.8 per square mile (18.5/km2).

There were 118 housing units at an average density of 48.1 per square mile (18.6/km2).

About 13.4% of families and 18.4% of the population were below the poverty line, including 36.3% of those under the age of eighteen and none of those sixty five or over.