Miller is an unincorporated community and census-designated place in Hancock County, Iowa, United States. As of the 2020 census, the population was 50.

Historical population

Census	Pop.	Note	%±
2010	60		—
2020	50		−16.7%
U.S. Decennial Census

As of the census of 2020, there were 50 people, 16 households, and 10 families residing in the community. The population density was 24.2 inhabitants per square mile (9.3/km). There were 26 housing units at an average density of 12.6 per square mile (4.9/km). The racial makeup of the community was 88.0% White, 0.0% Black or African American, 0.0% Native American, 0.0% Asian, 0.0% Pacific Islander, 0.0% from other races and 12.0% from two or more races. Hispanic or Latino persons of any race comprised 8.0% of the population.

Of the 16 households, 12.5% of which had children under the age of 18 living with them, 62.5% were married couples living together, 0.0% were cohabitating couples, 6.2% had a female householder with no spouse or partner present and 31.2% had a male householder with no spouse or partner present. 37.5% of all households were non-families. 37.5% of all households were made up of individuals, 12.5% had someone living alone who was 65 years old or older.

The median age in the community was 46.5 years. 28.0% of the residents were under the age of 20; 0.0% were between the ages of 20 and 24; 20.0% were from 25 and 44; 36.0% were from 45 and 64; and 16.0% were 65 years of age or older. The gender makeup of the community was 14.0% male and 86.0% female.

Miller was platted in 1895. The population of the community was just 10 in 1902, but had increased to 165 by 1925.

Miller 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.