View source for Gillett Grove, Iowa

===2020 census===
As of the [[United States census|census]] of 2020,<ref>{{cite web |title=2020 Census |url=https://www.census.gov/programs-surveys/decennial-census/decade/2020/2020-census-main.html |publisher=United States Census Bureau}}</ref> there were 30 people, 19 households, and 11 families residing in the city. The [[population density]] was 135.2 inhabitants per square mile (52.2/km<sup>2</sup>). There were 20 housing units at an average density of 90.1 per square mile (34.8/km<sup>2</sup>). The [[Race and ethnicity in the United States census|racial]] makeup of the city was 96.7% [[White Americans|White]], 0.0% [[African Americans|Black or African American]], 0.0% [[Native Americans in the United States|Native American]], 0.0% [[Asian Americans|Asian]], 0.0% [[Pacific Islander Americans|Pacific Islander]], 0.0% from other races and 3.3% from two or more races. [[Hispanic and Latino Americans|Hispanic or Latino]] persons of any race comprised 0.0% of the population.

Of the 19 households, 36.8% of which had children under the age of 18 living with them, 10.5% were [[Marriage|married couples]] living together, 21.1% were cohabitating couples, 31.6% had a female householder with no spouse or partner present and 36.8% had a male householder with no spouse or partner present. 42.1% of all households were non-families. 36.8% of all households were made up of individuals, 0.0% had someone living alone who was 65 years old or older.

The median age in the city was 45.0 years. 10.0% of the residents were under the age of 20; 6.7% were between the ages of 20 and 24; 33.3% were from 25 and 44; 20.0% were from 45 and 64; and 30.0% were 65 years of age or older. The gender makeup of the city was 60.0% male and 40.0% female.