As of the 2020 census, Earth had a population of 901, and the median age was 37.2 years. 28.7% of residents were under the age of 18 and 18.0% of residents were 65 years of age or older. For every 100 females there were 90.5 males, and for every 100 females age 18 and over there were 87.7 males age 18 and over.

Of the 329 households in Earth, 37.7% had children under the age of 18 living in them, 48.0% were married-couple households, 16.4% were households with a male householder and no