Hayfield is an unincorporated community and census-designated place in Hancock County, Iowa, United States. As of the 2020 census the population was 41.

Historical population

Census	Pop.	Note	%±
2010	43		—
2020	41		−4.7%
U.S. Decennial Census

As of the census of 2020, there were 41 people, 22 households, and 11 families residing in the community. The population density was 42.1 inhabitants per square mile (16.3/km). There were 23 housing units at an average density of 23.6 per square mile (9.1/km). The racial makeup of the community was 90.2% White, 0.0% Black or African American, 0.0% Native American, 0.0% Asian, 0.0% Pacific Islander, 0.0% from other races and 9.8% from two or more races. Hispanic or Latino persons of any race comprised 9.8% of the population.

Of the 22 households, 27.3% of which had children under the age of 18 living with them, 50.0% were married couples living together, 0.0% were cohabitating couples, 0.0% had a female householder with no spouse or partner present and 50.0% had a male householder with no spouse or partner present. 50.0% of all households were non-families. 50.0% of all households were made up of individuals, 22.7% had someone living alone who was 65 years old or older.

The median age in the community was 44.1 years. 14.6% of the residents were under the age of 20; 17.1% were between the ages of 20 and 24; 26.8% were from 25 and 44; 12.2% were from 45 and 64; and 29.3% were 65 years of age or older. The gender makeup of the community was 65.9% male and 34.1% female.

Hayfield was platted in 1891. Hayfield's population was 40 in 1902.

Hayfield is a part of the Garner–Hayfield–Ventura Community School District. It was previously in the Garner–Hayfield Community School District, which merged into the current GHV district on July 1, 2015.