In 2022, the population of Gardner was 127, a 0.78% decrease year-by-year from 2021. Previously, in 2021, Gardner's population was 128, a decline of 0.78% compared to a population of 129 in 2020.
The median age in Gardner, ND is 36.2, as per 2021 ACS 5-Year Estimates. Of the total population, 31.94% were under the age of 15, 6.94% aged 15 to 29, 47.22% aged 30 to 64, 13.89% aged 65 to 84, and 0.00% were 85 years of age and older.